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personally, id use a real dial bore gauge and not a regular caliper. you may be able to rent one fromautozone or such(maybe not though) or once you have the block apart, take it to a machine shop and have them measure the bores, just so you know for sure. but i think you said you were only changing the heads so that wouldnt work.
also whats the stroke of the crank? has it ever been cut?
length of the rods? are the pistons domed flat or dished? and the cc if domed or dished? you need all that to figure out the compression ratio and then you need to know CC of the head combustion chambers youd be getting. If you just wanna throw vortecs on this motor and run it, be my guest but i'd never do that for any of my cars...
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