360 camshaft for 8.4:1 engine

I like the Lunati Voodoo cams especially if it's a low comp. engine. The Lunati 60401 would work real good I think but double check to make sure you have enough retainer clearance as the lift is rated at .475". They are a very fast rate cam which helps build cylinder pressure quickly. The Summit cam would probably work pretty good too. You mentioned it's not much bigger than what you have now but in reality it is quite a bit bigger if your cam is stock. Sure the lift isn't alot more but the duration is what matters most and it's a good 20 degrees at .050" bigger than a stock cam. Even though the Summit cam is rated to 4500 rpm I'd expect it to pull to 5000 decent. The ratings they give are just a general guideline and alot of other factors some into play to determine where it peaks at.

Most high perf. aftermarket cam mfg.'s suggest using an adjustable valve train but I have used stock rockers on perf. cams as big as your going. You just have to check the lifter preload to make sure it's in spec. and make sure the arms are in good shape. I've read another reason they suggest aftermarket arms is because the factory arms weren't real accurate on the ratio. Even though their spec'd at 1.5 ratio it can be as low as 1.37 to 1. That decreases the cam size a little and therefore you don't get as much perf. as the cam is rated at.