I have a 67 Firebird 400 automatic convertible in very close to original condition. It currently has an Edelbrock performer intake manifold and a Holley. I have found a 69 GTO/Firebird RA III 400 intake mnifold on e-bay that looks to be very well restored. I would like to perhaps go back to a quadrajet. I've been told I would need a sread bore to accept the quadrajet, hence the need. You guys have been tremendously helpful and I value your opinions and comments.