Ok...Bradley your getting me confused man

Are you wanting the Stage 1 or 2? Your valve size is 1.94/1.60's in the GT-40's I believe. I wouldn't change the size, your only feeding at most a 4.030x3.000 hole. You will be fine. I have built cars that are in the 11.5 second range with this cam. Not bad at all for an off the shelf camshaft.
Murdock