Will a 1971 buick 350 cu inch Motor interchange with a 1976 buick leSabre 350 cubic inch engine

350 inch until 1971
The engine serial number is stamped on the front of the left cylinder bank. The production code number is between the left exhaust manifold and the two front spark plugs.

Could be a 194,230 or a 250 six cylinder engine.

You will run into an issue from the VATS antitheft system of the LeSabre, not working with the key/ignition of the Skylark

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1964-1972 was the model run. This is the only one I could find during that model run.
http://www.autowiringmanual.com/wp-content/uploads/2011/09/1965-Buick-Special-Skylark-Wiring-Diagram1.jpg

This is one for sale specifically for 1971 and it is laminated and in color: http://www.amazon.com/Buick-Special-Skylark-Wiring-Diagram/dp/B002XR8NPC

NO !!!!!!!!

Depends on which 3.8 you have because there were two avaliable in that car .One was the buick 231 cubic in and the distributor was on the fron of the engine.The other was the chevy 229 cubic inch engine and the distibutor was in the back just like on the small block v8.If you have the buick motor be prepared to swap everything including wiring harness and transmission.If you have the chevy v6 it not so bad but you will really need a donor car(monte carlo,cutlas,lemans)with a 305 or 350 for the wiring harness ,radiator shroud ( shorter on the v8) ,a/c lines (longer on the v8).Years ago I had a lemans wagon with the chevy 3.8 that i put a Monte Carlo ss motor in and it looked like it came with it.bought a wrecked mc( hit in the rear) and swapped everything.Including coil springs and sway bars front and rear.And yes the SS 15 inch wheels too! It was a real cool sleeper.Miss that car.

Here is the firing order for that vehicle and engine, that is if it does have a Buick engine with the distributor mounted on the front of the engine, but if the distributor is mounted on the back of the engine then it is an Oldsmobile engine and I have that firing order diagram also if you require it.

that depends on if the engine is the same cubic inch like a 3.1 or a 3.4 and you need to pay attention on the mounts if there the same if everything looks the same i would say go for it..

BACK IN 1985 BUICK REGAL HAD 3.8 V6 231 CU INCH ENGINE.BUT BUICK ALSO USED THE V8 307 OLDS ENGINE.V6 263 DIESEL AND V8 350 DIESEL ENGINE.BACK IN 1985.

its the brown wire open your trunk and you will see a wire next to the trunk lach with a conecter