Cylinder head discussion 340 with stock above deck pistons

Ok, 40 lbs off the nose is worth it alone. I have run the 65cc OOTB eddy RPM’s and run 12.3. My compression was about 9.75-10.0.with a solid flat tappet and stock 340 manifolds and a massaged stock 68-69 stock 340 intake with a 800 eddy AVS. I’m at 410 ci. The reasons to go aluminum, weight, starting with a better casting, and easier to get ported now a days and easier to weld, but don’t expect a huge gain.