What should i gap my plugs at on my 95 mustang 3.8 v6 bosch platinums

It depends on the plug. The OEM Bosch is pre-gapped. All others are 0.050 (50 thou) or 1.3mm.
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There is a little controversy about this. Searching the web, the best explanation I see is:

he 0.061-0.068 gap comes from the Ford OEM Service DVDs for 2003, 04 & 05, for the 4.0L Explorer, Explorer Sport-Trac, Mountaineer & Ranger, originally equipped with the Motorcraft AGSF22PM plug. Interestingly, in 2005, the Mustang started using the same 4.0L engine. In that application, the engine was equipped with the AGSF24N plug (a hotter plug). The gap on the DVD is shown as 0.052-0.056 in.

Through 2002, all 4.0L SOHC plugs, according to the Ford DVDs, are gapped at 0.052-0.056, using AGSF22PP plugs as replacement plugs.

The 4.0L SOHC is a waste spark engine, which uses slightly different plugs on the left & right banks.

Replacement plugs are usually double platinum, suffixed PP so they can be
used on both banks.

On the 2006 and later Ford DVDs, all 4.0L SOHC plugs are gapped at
0.052-0.056 in.

On the Ford OEM parts site, the AGSF22PM plug isn't listed. The replacement
plug for 2003-05 4.0L engines is the SP400, which is shown as having a gap
of 0.052-0.056 in.

The sites for Autolite, Champion and Bosch all list replacement plugs, for
those years as having a gap of 0.054 in.

Bottom line, it looks like the original plugs in the 2003-05 engines, except
for the 2005 Mustang, were gapped at 0.061-0.068 in. Replacement plugs,
regardless of manufacturer, are gapped at 0.052-0.056 (0.054), regardless of
electrode type (iron, copper, platinum, double platinum, or iridium.

If you buy new plugs that are correct for your car, they normally come pre gapped (particularly platinum and other 'non copper' plugs). I like to run 36/1000 or 0.8mm. But 1.1mm (43/1000) is also common.

For the 3800 V-6 the gap should be 35mm, your auto parts store can confirm this...always good to be precise.. use AC platinum tip or Iridium only for best life....

Motorcraft 5460-05048453
gap is .054
be sure to check the gap even when you take it out the box.
motorcraft are parts for all ford/Lincoln cars

One of the best plug for the 4.0 V6 is the Bosch Platinum Part number 5256-05252087. These plugs come pre-gapped so you don't need to worry about that. The bad thing is, they're almost $5.00 each. In case you buy a plug that does need to be gapped, like the Platinum Plus plug, the gap is 0.054 in.
Good luck and Happy New Year,
Bill

Premium performance offered by Bosch platinum plus and also has excellent value while the Bosch platinum-Ir fusion delivers ultimate in spark plug performance and long service life.
http://autoplicity.com/manufacturer/95-bosch-spark-plugs.aspx?categoryid=53

1995 GMC Sonoma 4.3 ltr V6

The plug gap is .040 inches for the standard type plug.(original equipment spec)

If you go for an upgraded plug (like platinum or double platinum types ) the gap is .045 inches.

If you go away from manufacturer brand then Bosch makes good plugs. Unless you have a high performance car then it isnt really necessary to be the high dollar plugs. The most important thing is to make sure youg et your gap right before installing. to check your gap just buy a 99 cent gapper and check one of your old ones when you remove it.

Personnaly, I go with the manufacturer brand on my cars.
My ford uses motorcraft and my 70 mustang uses Autolite.

These engines use platinum plugs-you don't gap these type of plugs because you will damage te platinum electrode and cause misfire problems. Make sure you use bosch platinum factory recommended plugs and if he vehicle has more than 75k i would recommend replacing your plug wires as well/