DKing Doug there are at least 10 threads about this topic. You cann't compare apples to oranges. If you are 5'5" and weight 150 lbs, A small block will be easier to drive. There is no power steering. Motor weights can be made to within 100 lbs of an aluminium 427 and cast iron 289. Small block orginial cars have 3 inch tubing (round) BB cars have 4 inch tubing( round ) Unless you are trying to build an orginial car down to the last rivet, you should take a hard look at some of the other Replica cars on the market. See how the bodys are mated to the frames. The happy middle of the road the last couple of years is a stroked 351 windsor out to 394 cu. You can make 500 hp and 550 tork and keep the cost incontrol. good windsor is 12- 15 grand. An alum 427 is 17500.00$ for a small stroker, 452 cubes. In a small racing track the small block wins hands down, on long racing straights the BB comes out on top, however it takes more braking to slow that big monster down. Go to a couple of car shows and talk to the owner both BB and SB, and the stroker guys too. The first question you need to ask is what are you going to do with the car?
Lay out a game plan and stay with it.
Rick Lake