Well I'm only going to drive the car during the summer and on the weekends so that's like maybe 20-25 times a year and most of the time I will be driving the car to car shows, 3 track days a year and the occasional street race. So I hope the engine will last fairly long. I just checked Wiseco's online catalog and the lowest comp piston they make is 9-1comp ratio. I looked on JE's catalog and they have a piston with 8.1 comp ratio with a 70cc head. Sounds like a plan about the heads, do you ever get any used sets ?