Good 400+ HP 360 build

Totally doable. Listen to Mike the Mopar "Whisperer" from MRL. Solid flat tappet in an LA is a good choice especially If your going new pistons and can get the compression up a little. What new top end do you have? Stock heads reworked? Aluminum heads? Intake? Nicely prepped heads and an air gap or rpm intake and Holley or Quick Fuel 750'ish carb will get you there no prob with a good cam. Devil is in the details...

I have a set of 915 casting that came off of a 340 I'm pretty sure, they are rebuilt and have 1.6 and 2.02 valves in them. My intake is a weiland action plus, and I've got a 650 holly, I'm now starting to think it may be a bit too small of carb though. I'm wanting to keep this build somewhat cheaply, new pistons which will most likely be zero deck will be the last thing I really want to buy for this engine.