finally building!
Check out Ace Crankshaft in Deer Park. I've never used him myself, but I've heard good things and I have spoken with him on the phone. He seemed to know his stuff and was reasonable as I recall. I was looking for a hone job on an LS1 I was building (the liners in those are too thin to bore, 3.898 stock bore to 3.905 forged pistons) and he seemed to be the most reasonable around. I never went through with it because I then traded my '01 Z-28 for my '68 Barracuda before I finished it. You can try PCHS (Precision Cylinder Head Service) in Bohemia as well. Him I have used and was pleased, but he is a bit pricey.
I know you just wanna get out there and tear things up with the power the big block will have over the slant six, but from experience you won't be happy chasing the gremlins that building stuff like that will bring. Rather than posting four pages of me rambling about it, I'll shoot you a PM with my contact info. and we'll talk about it!