Be careful about swapping to a carb that doesn't include a governor- - - -low gears and heavy loads are an over-rev situation just waiting to happen. A tall block 427 truck engine would be virtually a drop-in swap, once the 366 gets a little tired. Are those twin screw rear ends, or a 2-speed drive axle with a tag behind it?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!