440 duster. Need engine build advice

I would run what you have in a heartbeat,going by what you've stated sounds like its already been balanced,aint nothing wrong with a cast crank or the speedpro pistons,with good headwork you should easily achieve around 525-550 hp,are the pistons flattop[I assume they are with closed chamber heads]I would be chking the compression ratio and try to keep it 9.5 or under if you plan on running on the street and pump gas.....