I ended up doing a compression test before I left, at my elevation in Utah I had 170 psi on an un-broken in motor. It has been my experience that they usually gain 5- psi when they break in. I ended up buying straight race gas out of the pump, 110 Sunnoco in Yuma, and backed my timing down to 0 degrees on the plate. I never did do another compression test down there to see what it was but it had to be close to 190 psi I would guess. Everything worked out o.k., the engine ran good but I took it easy on it for the most part. Got after it a handfull of times on the sand highway where they race on the last day. I was going to change my domes but the air freight never made it before we left. Thanks for the info.