piston questions

I figured as much but thought it wouldn't hurt to ask because just like that 1/2" socket that mysteriously disappeared until you return from the store to get another one then magically appears, I don't want to go but a bunch of parts and then have an "oh crap I could have used those instead " moment.
I can't believe what I'm having to spend between 2 of these trucks to piece together a couple of decent interiors for instance..... My 85 /6 truck and this 83 that I'm getting ready to build this motor for .... And I still need door panels/door "cards" for both. I have leads im following up on about an NV 4500 for this one, and a couple of more leads on a bell housing to mate the 4500 to this engine.... Still need a flywheel and the answers to the questions I've raised will have merit towards things like getting the right flywheel....