will an 87 4cyl standard flywheel fit on a 87 v-6 that has an automatic?

by standard I assume you mean a 5 speed, and that would be no it will not work. A standard uses a flywheel but an automatic uses what is called a flexplate. Very different items and are not interchangable.

what I want to know, is can I use the 4cyl flywheel on a v-6, to change from automatic trany, to my 5 spd trany. Putting in a v-6 that was an automatic trans. to my 5 spd car.Or, do I have to find a v-6 flywheel ?

I believe the 2.5 and 2.8 did use different flywheels, but I'm not 100% on that. I think I've seen a thread or two on here where other people have posted similar questions and the general consensus was that the two are different.

If I have a parts question about interchangeabilty I go to a parts store and have them check part numbers. If they are the same it is a guaranteed fit. If they are different they prabably are not a swap. Hope this helps.
Jim

You have to find a V6 flywheel. You also need to know what year the engine is. 88 flywheels are nuetrally balanced (engine is balanced internally), while 87 and older ones are externally balanced.

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ok,it looks like the v-6 will be put in as an automatic then, next question, will the automatic shifter,cable etc,from an 88 hook right into my 87,when I put the 87 v-6 motor and trany in? or do I need to put the 88 automatic trany on it first? (88 had a 4cyl in it)

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5-84's,1-85,1-87,1-88 all 4cyls. 57MGA-350cu.in,4bbl. 57MGA,4cyl