440 into 64 Valiant?

What exactly will it take to put a 440 BB into a 64 Valiant and still have it driving as well it does now with my small block?

I've come across a BB w/ aluminum heads which I am sure will still make a big difference in comparison to the weight of the small block, so in reality, is this worth the conversion?

What do you know that can help me out?

Schumacher is selling the motor mount kit to put a B/RB in our Early As
http://www.engine-swaps.com/Pages/ProductsYear/63.66aBody.html