I second the 4R and as far as electronics are concerned the Quick4 is great. I can store multiple tunes in the controller and pull them up while driving. I THINK there are some older 4R's that may not need a controller or you can just have it built with a MVB.
IMO, the electronics would be better that way you can have a high stall for racing but lock up the converter on the highway bringing the revs down not to mention it has OD and all this can easily be programmed.
Dan Gilsdorf (Silverfox) can build it in a multiple configurations just talk to him and see what he can do.
ks