Good mods to make torque in a 440

The iron heads will need between $1200-1500 in terms of getting ready to bolt on, using costs around where I live and the quality level I demand. Aluminim "ready to run" of any manufacturer will need another $400-600 on top of the purchase price and shipping. In your case I'd use the 516s as the 452s won't give you any compression boost and in all other facets are basically the same (flow, weight, quality, etc). The Stealths (or any aluminum will give you a weight savings in addition to that closed chamber. That's about all you're going to get from running them on this particulat shortblock - but they have ple nty of room to grow. So you have to look at the cost benefit and figure it out what's best for you.