Don't give up and I hope you have fun. However, porting cylinder heads correctly is an art. It is better done by treating it like heart surgery, rather than pounding in railroad spikes. Without a flowbench you may make some gains and you may destroy every port you touch, and you'll never know which is which. Some of the first things we try like the pushrod pinch and gasket matching the intake has almost no measurable effect until the throat, bowls and combustion chambers are correct. But don't quit, you just keep giving it your best.