Cam change with more lift. Same/similar duration. (Avoids a converter change) May require the guides height to be addressed as well as spring fitting.
Head porting.
Get a 2.05 intake valve and use a 38* top cut. Unshrouding the intake valves. Use a 45* seat, with a 60 and then 70-75* cut and blend it into the bowl.
Keep the 1.60 exhaust and do a radius valve job on the exhaust with the same 38* top cut. Blend the bowl into the valve job.
After that, you can still make more power but it's more work.
You are WAY down on lift, even if you didn't change anything else.
