Opinions on 360 vs 440

I love big blocks, but...

The car was already sporting a small block, so build it the way you want and sell the BB. I had a 408 in my 70 Duster and it was a runner! The lightweight A body with a nice 408 (465HP) was a fun ride. You can certainly shoehorn a BB in there, but just about everything would need to be changed to properly handle that swap.