You dont drill the intake. You drill the heads. And if you dont have a airgap yet, they make magnum airgaps, or get a 'summit' crosswind intake that has both bolt patterns. With a reasoning like that, doesnt sound like its has research behind it....
And people are suggesting magnums for no reason, they do hold a good amount of potential.
Btw i paid $120 off ebay for my brand new magnum airgap thats sitting in my garage waiting. Deals are out there if your patient...
Your engine will only be as good as your combonation. Your forgetting the most important, torque converter and gearing. . .
Cheap roller rockers? Um, no. Stay stock, you gotta pay to play. Dont cheap out on valve train, stock stuff is overengineered and is more than enough. .02