Years ago I put Hooker Super Comp's on my 72 Demon w/400 B block and loved them!! Just my opinion though. I've heard some of people don't like them, but I encountered no porblems with mine. I believe they were 2 1/2" diameter primaries into 3 5/8" secondary. Motor was 10:1 compression, MP performance cam, 3200 stall & 4.10 gears. Sorry about the fuzzy pic, as they are pics of old photos......