Weight on the front end is a bad, bad thing in road racing, rally, auto-x. I'd far prefer a small block with AL heads and intake to drop 100 lbs off the engine and front end weight. Weight is always a big enemy in cornering, and, besides, you can easily get RWD torque to exceed the available traction while cornering (which is lower than straight line traction) with a small block these days, in all gears except maybe the top one. So the big block is a poor choice unless you are on a wide open course with long straights.
