John, I like the idea of a SBC.... a B motor would be great and very easy to get 700HP....
my 370 C motor is old school ( 1997 Nascar technology ) and made 714HP
New Dart SHP Block, Comp Solid Roller, nice forged crank, JE Forged 18 degree Pistons, Forged H Beam Rods, Carillo Rod Bolts, 18 Degree Bowtie Heads, Ti Valves, locks, retainers etc..Jessel Shaft Rocker set up. Ok Victor Intake, 850 Quick Fuel Carb, Home made headers.
Nothing fancy above..no where near the SB2.2 potential,,, but it's what we had,,,I should get another oil pan and vacumn pump or bite the bullet and do a dry sump system.. also a Jessel Belt Drive set up would help.
Good luck, looks like you are on the right track.
FYI,,, my Motor guy has SB2 stuff and can de-tune a B motor to 750HP if thats all the HP you want.
Charles