I ran rkt drop in pistons with par 12.5/1 head and an slp pipe with PCV controller with SLP stage three map.
This combo ran very well, hit DET a few times each ride when chopping on and of throttle, this was at only 300ft.
But, you should have someone with experience and the right equipment to measure and confirm piston to cylinder wall clearance with the new pistons, just to be sure they are not to tight