Cam sizing

I agree those 2 cams listed in post #1 are way too big. Just to make them work you'll need to have the spring pads cut to accept dual springs and have the guides cut down to accept the lift (ok, the 1st one might be ok with the lift but it's a gamble I wouldn't take). The cam Moturbopar listed looks much better and you shouldn't have to do anything to the heads except put on some better springs. And if their in good shape keep the 318 heads on it or you'll most likely loose low end torque like tqofosho said. What little gain you'd see with the 360 heads would not overcome the loss of torque. It doesn't take much cam to make a teen lope and one ground on a 108 center will sure help it plus still have decent low end torque which you need with a small cube motor and less than 3.91 gears and 3000 stall converter. JMHO