Need instuctions to a fast way to take off a flexplate from a 1971 chevy c20 truck

https://www.partsgeek.com/catalog/1986/chevrolet/c20/fuel_delivery/fuel_sending_unit.html when you enlarge the diagram will see that its a 2 outlet

there are 6 bolts connecting the trany to the engine. They all should be easy to take out. Are you talking about the three nuts that are used to bolt the trany torque converter to the flexplate? If so, rotate the flexplate to reach the other 2 nuts.

Hi
You need to remove and clean with a carb cleaning product the carburettor and air blow it
Catalin

Probably bad master cylinder

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In the Alternator

got to remove the transmission to get to the flywheel

Start by isolating the issue. Remove the belt and start the engine. If it is still there, it is likely resonating through the engine from the flywheel/flexplate. If it dies, spin the alternator. This was a problem in some of there cars. Let me know what you find.

take the old one off and then fit the new one ,but you must remember how you did it ,a 71 model you should be able to do with your eyes shut and one hand tied behind your back

Have you chk. the starter switch on the steering colume under dash? Or is starter drive kicking in but not engaging teeth in flexplate? If its not engaging teeth on flexplate starter needs to be shimmed, or if its missing the teeth altogether on flexplate or bearly catching the teeth, top of starter nose wear it bolts up needs to be filed down to engage the teeth on flexplate.