Stay out of the throttle and get tuned. If you have lots of cam timing in there, then it's going to go pig fat at idle and low rpm. This will wash oil film off the cylinder walls and kill the rings. If you have an adjustable pressure regulator, drop some pressure out of it to lean it down on the low speed side, but stay out of the throttle. But I am only assuming about cam and such as I don't know your parts combo.
Feel free to email me and I will straighten you out. I build these engines and make camshafts for them every single day of the week. Watch your lifter preload and you will gain lots of power and mileage.