[Marty Rinehart Jr]

Rick, you should really start by comparing your on track incremental times and mph of the good runs to the bad. You can then make a better pinpoint of the spot where your losing your power. If your mph is up at 660 and 1320, then you can come to a conclusion, it's not the engine, trans or converter. Look at the other incrementals and find where it's dropping off and if it's only the 60' times that are slow. It may be as simple as the track your racing at may not be preparing the starting line properly due to the car counts being down. They could be trying to make up their profit margin there. I know a lot of the points races we ran at this year, we had to keep the car very loose to make up for a bad track.
Just another opinion. Hope it helps