OK first let me go back over why I'm doing this, I'm rebuilding a 305 for my 84 k5 because I've got a free rebuild kit (all high performance parts) and am picking up a 305 in a week and a half. I'm trying to improve over stock low end and midrange power while still keeping some kind of usable mileage. I don't need it to shred tires or anything. (In fact I hope it doesn't, they are expensive) I've got my top end narrowed down to vortech heads with a performer intake, or a set of torquer heads with a matched intake. Anyone have experience with either on a 305? It will be bored 30 over with a high energy 260 cam from Northern.