I did some some work on the heads. I opened the intake ports and smoothed them a bit after gasket matching. Cleaned up the bowls and exhaust too. Maybe the work I did helped more than I thought it would. I still wonder if more timing wouldn't have made a big difference. I think it was set at 32 degrees total all in at 3 to 3200 rims.
If your WOT AFR is good you can bump up timing 2* at a time until the car slows down, then go back. I always run at least 2 passes when making a change to see if the car likes it.