The tires are 33s. I am running a powerglide. Shift at 6500. I have been looking at a lunati roller, 630 something lift, and i forget the duration but it was a lot, 330 maybe but I forget. Any suggestions? What about headers, collector length etc. I hate to lose the zoomies, they look cool, and they sound gooood! But I will for a good cause, What about piston to valve clearence, Im running wisecos with i think .250 dome. If you need more info, ask and ye shall receive. thanks.