I would use a 750 vacuum secondary Holley 3310 with the regular rpm intake (not air gap, not spread bore).
get the compcam 911-16 springs.
make sure to measure installed height now. some 781's had less than 1.900 installed height which will make too much seat force.
I try to run the least amount of spring possible. I feel the 911-16 are a little too strong. I try to set the seat pressure at 100lbs and around 275lbs at max lift with a cam that size. You need to have some tools and take some measurements to get it right.