[mdross1]

Aluminum heads alone will take 40 lbs off the weight.Then there are the intake manifold and water pump that could be changed out to aluminum.The big blocks only issue in these cars is the torque hit especially in cornering.All that I have read from the pro's who used to race these cars all the time was there is no real difference in handling between the two motors.
Our 460 car has a weight bias f to r 47-53.Once we had it scaled it was like being on rails driving this hot rod.Road racing these cars with stickies all around really taxes your staying planted in the seat even with 5 point harness.Really should have two seats one for street and one for road racing.
Do not be afraid of stepping up to a big block.After all the years we have owned our car opening the hood always makes me smile.