Dave, you are correct, I checked with the Carb Shop and it is a 780, my mistake. BTW my last Holley was a 650 on a 68 Firebird 22 years ago! The current manifold is an aluminum Offy, not sure if it is a proper application for this torque monster. I am almost afraid to get it running right, it just wants to go FAST!!!!! Thanks for your input.
Mike