I have a 468 in a 3600 lbs 66 Chevelle. I picked a 268-272 .697-.731 earson camshaft. Car leaves really well"1.36 60 ft on the back tires and runs 6.16-6.18 all day. I have a set of out of the box Edelbrock rpm performer square port heads, 13.3 comp, 400 turbo 5800 converter.....