I hope your setup works better that my carby setup did, i had 2 x 350 holleys adapted to the oridginal lower inlet manifold, for spark i modified a chrysler V8 electronic dizzy to drive of the front of the left camshaft, similar to one of yours. I used a MSD 6AL as the ignition module. On the Dyno Dianamics dyno it ran a best of 150rwhp which is way down on the 214rwhp the same motor has run with fuel injection. There may have been more in the carbys with more development.
Your setup looks the part, i hope it works out well.