I agree with 76 GMC 1500. The AFR heads seem to work well. AFR
use to make 180, 190 & 195 cc runner heads. They stopped making the 190 cc ones cause the 180 flowed just about as good as the 190's. The 195 cc were actually just 190 cc runners opened-up to match the Edelbrock Victor Jr. manifold. I think I'd use the 180 cc with an Edelbrock Performer Air Gap Manifold. It will work very well in the RPm range of your 292 cam. A 750 cfm Holley will work well here also. Look at Holley #4779, it's a double pumper and I've had very good luck with them on the ddyno and on the street.