What to do with my 360 magnum??

Get the Hughes pump eccentric and older cover to use.
The stock heads can produce over 400 HP. The example I pull from is the MP 360/380 engine. It is a otherwise stock engine given performance parts. It used a single plane I take, 1-3/4 headers and a MP roller cam. I forget the specs but the intake duration was 288 advertised IIRC.
The proper flex plate can be purchased from B&M. I now nothing about making a Mod to the OE plate.