Aluminum vs Iron compression on pump gas

I would say that with that large of a cam, you should be OK, even with the tight lobe centers. I would most certainly run premium fuel though until you have everything sorted out, then you can experiment with different fuels. Good job on getting the quench right too. :)

Technically, iron will make more hp than aluminum but aluminum is easier to port and is lighter and will take 50lbs off your front end so it's a toss up. Aluminum also dissipates more heat which is both good and bad. If it were my car, I'd go with the eddys.