430+hp 340 possibilities

430 to 450hp out of a stock headed, stock stroke 340 doesn't sound like a budget build.

Having been through doing a set of iron heads over including porting and oversixed valves and also having bought aluminum heads OOTB, stage I, II and III aluminum heads. Just be sure to weigh you options wisely. Stock heads are expensive to mess with and in the end you often have an unrepairable sub par piece and spent as much or more money.