I wouldnt use forged pistons if you dont plan to balance it. It puts things out of balance in the worst way possible. You can run an engine "overbalanced" pretty easy. That's when the counterweights are heavier than the reciprocating parts (pistons and small end of rods). If you really want to save $$, and the parts are servicable, maybe just ring and bearing the 440. Otherwise, do it right on a budget, and you'll have something to sell when you're ready to swap in the bigger one.