I finally took the Powerquest out today to some testing and was not happy. The first part was to advance my timing from 29 to whatever she ran the best and back it off a little. I thought I would see the biggest improvement w/ my first few degrees but got nothing. Calm winds, oil temp stable I mad a run w/ a 23" 3 blade saw 60 mph gps and 5000 on sniper display. I bumped the timing to 32, made same run, no change on either. I did not want to advance it any more. Midrange a/f ratio is 12.8 Full throttle is 12.4. I did not do a shutdown and read plugs, I just did not think about it at the time. The second part was to play w/ the 5 props I had. I changed to a 21 3 blade mirage. 5350 and 61.5 mph. I had some 4 blade 23's revolution, it was just too much prop, dropped to 58.5. I was expecting to see improvement up to about 36 degrees but will keep it at 32 for now. I really need to go out w/ an experienced tuner who can look over my setup and advise me on what I am overlooking. A very disappointing day. Did a compression check in the driveway after an hour of the flush. 6 cyl's were 170 1 was 179, one was 161. I checked the 161 again same result. Plugs were very white from the 5 min at idle and 14 afr. gaps at .045 run by the DUI distrib. w/ dedicated 12v 12 gauge wire direct from bat thru relay. Willing to drive most of Florida to a reputable performance shop if anyone knows anybody. Thanks everyone for the prior input.