Big block rebuild - where do you buy your parts?

Stock pistons Rusty.. I'm going to measure how much they are in the hole, ( late 69 engine) and just cut the heads to try to make some compression. Simple , low buck build. Don't have a lot of $ to play with, but had good success in a 68 383 and a 66 440 years ago with stock components for a street engine. I see your tech stuff on here and know you've thrown quite a few together.
It's going in a 71 Demon. Has a stock built 727 with shift kit, no convertor yet. And 410 8 3/4 sure grip. Street driven purpose and beat the hell out of it at time. I have a dual plane edelbrock intake and am looking for a 750 DP to round it out
Working on finding a good distributor that I can adjust the advance to suit it and have a set of headers given to me. Idk if they're 15/8 or 1 7/8 primary tubes. That's all I have for info for you guys right now.
Instead of cutting the heads you might wanna just look at thin head gaskets.. i'm using .028 compressed on mine to bring the compression up a bit.