I noticed a note on reversing the rotation of motor and its effect on handling. Why not mount the motor on a free to rotate cradle and restrain it to the chassis with a spur gear. Now the rear axle torque loading stays the same and the front end torque loading is reversed, so LF is loaded by engine torque. Now you have best of both worlds.
if you attempt this .. you will need a reverse rotation starter motor.. visit the marine starter catalog as they are listed there for some applications...you will also need to talk to your crankshaft provider..as the oiling passages MAY be on the WRONG side of the connecting rod journals of the crank...you might want to think about offset partially grooved main bearings. so the groove for the oiling tapered to the flat bearing surface. you may want to have a similar machined groove done on the rod bearings.. if you really think you can get away with it..i know that i had to go over to a boat yard one time.. when the workers there removed the spark plug wires from a reverse rotation motor without making a drawing of where each one went first.. there were 8 workers there that did not have a clue of how to redo it.. they were amazed when i pulled all the plugs and borrowed some of their fingers to figure out which way it fired..