Velocity and volume go hand in hand. Experience plays a strong hand here. For your stated engine and vehicle usage, the Edelbrock Performer RPM intake manifold would probably serve you best. And you can increase it's efficiency by blending with a radius the plenum to port interface and port matching the intake to head interface with templates that you make out of poster board. Make one template of the intake and lay it on the head and make one of the head and lay it on the intake. Any metal that protrudes into either template port opening is to removed and blended back. As far as quantifying, do some research.
No, providing you are not changing out the rod bolts. If you are, the consensus is that the rods have to go to the machine shop to have the big end bores trued. And if you do that, as Money-pit said, you might as well buy some Scat "I" beam rods.
DCR is comprised of many factors and is subject to octane requirements. The intake valve closing (IVC) of the cam you chose is 66 degrees after bottom dead center (ABDC) and if you input that figure into Wallace Racing Calculator, and there are others, you will get 7.64 DCR. And I have been instructed to add 15 degrees to the ABDC degrees figure to get a more accurate DCR. If you do that, your DCR will be another number lower. There are people on this site running DCRs of around 9.25 on pump gas, however, they have their ducks in a row.
I would suggest that you contact a vendor on this site and get a custom cam to your stated compression or with that vendor, set up your combination. Also, the valve pockets in the builder pistons do not have enough radial clearance for 2.2 inch valves.
As you said, the results are in the details.
Last edited by DanE; 02-23-2016 at 05:14 PM.