[jmil1974]

Depends on what you want. The 350HP/400ftlb Ramjet is nothing to sneeze at. It's actually quite stout and the same as the ZZ4. If you want reliability and some gas mileage/ big drivability bonus, go that way. It will be harder to upgrade the power down the road but you can now do it. You'll also have to modify your fuel system. Not a huge deal but you do need to plan on it.

If pure power is your motive, I would get the HT383 and do a cam swap. Similar to the suggestions on the fast burn but I think our trucks would like the extra inches/torque provided by that motor. Either way, you should be quite happy.

As important as reliability is to me now, I'd go with the RamJet. Good luck!