[BrianG]

That's gonna be a heavy Jato with 5s and an L motor!

One thing you'll notice that with the Jato being RWD and the majority of the weight in the middle is poor traction in dirt. Certainly driveable, but a little squirrely. But if this is just for speed, then you should be ok.

FYI: I have the MM 4600 system in mine, single speed tranny, on 2s, geared 54/22 (IIRC) and it was clocked at 47mph. Not fast, but considering I could easily go up to 4s...