The hotrod headers will fit your chassis. I have used them in a chevelle. It is hard to keep them sealed up.
I recomend a small 4 bbl( 390 holley list 8007) and a Comp 260 cam. That is a start and then work on the head. That is where you can gain some good power too. Tom
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com