Sorry, parts are parts. No extra work at all, did it all the time. Some combinations just work. Cubic inches don't matter to me. Not everybody "needs" or "wants" a big inch engine.
1. What do you have?
2. What can you get and for how much?
3. How much to finish it and make it what you want?
Otherwise, for you big motor guys, just get a 400 or a 440, stroke it and be done.
Just for the record, I'm stuck in the 60's for car stuff. I didn't make it to the 80's.