Go with a small set of compounds, the truck will be fun to drive, clean, and will tow well. Like I said back on the first page I had about the same truck as my old work truck, s300g (which is a 57mm) internally gated with a box 475. I ran 5-18 injectors, 191 delivery valves, 25 timing and with the afc setup right was about smoke free. It would run hard in third, do rolling burnouts in 4th, towed great. I don't know what it would dyno but bet it was about 600. A big single on a 5sp sucks, it only pulls strong in 5th and about 90mph, kinda useless. There are allot better choices than a box 475 with the big turbine but it was cheap and ran good.