400 and purple cam

to the OP: I would imagine your lucky if you have 8.0:1, more like 7.5:1CR, dump the 509, totally the wrong cam, buy a cheapo summit cam around .460" and around [email protected], and it'll run much better and perform to all it can with what it has, won't need anything special for a converter/gears and that 600 carb is somewhat small as well but will work. If you wanna make some power as in 350+, its possible with some better heads that flow somewhere around [email protected]", a good intake like an RPM or Street Dominator and a bigger carb at least 850cfm, low CR can make good power with the right parts, but you can kill it all with big duration cams that have late closing intake valves effectively shortening the effective stroke and lowering already low DCR's........my 2c's.