I have a 67 camaro with a bbc 427, I put the stage 1 procomp aluminum heads on with a crower solid roller 580 587 254 260 @50 112 lsa. I have 185 compression per cyclinder. and a 7513 weiand open plentum. What size carb should I use? I have an 800 duble pump on now, it does ok.