Hypereutectic pistons are a good choice for cost and durability. I would suggest a decent brand like speed pro but others will have good advice.

I am not sure you are going to get a 9+ compression to run on regular. Around here the regular gas is pretty crappy. Mid grade possibly. Premium yes.

A 440 is a torque monster but the internals are slow to accelerate. Take advantage of that, a Lower rear gear and an overdrive will let it rev faster and still end up the same cruising RPM.

My

Others will have good advice too.