950 Ultra XP tuning on 500"

PRH said
Damn straight.

I’ve dynoed probably 8 motors with Pro Systems carbs.

One was quite good, one was pretty good......... one had some weird issues where it would die after you ended a pull(same problem in the car on the track. Carb was sent back to PS for a tweak....... still did the same thing when it was returned), on one the fuel curve was all over the map and it didn’t make very good power(got sent back at Patrick’s request and replaced with a different carb that was “fine”, but nothing special).
The others were no better or worse than another unmodified carb.

Too bad you didn't have the time to pin the car and see what exactly everything was drilled to. I remember one discussion I had with Pat about emulsion. He wanted way more than I thought I would need. He said it was because it was a stick on a two step.

I couldn't get him to tell me how that makes a difference. I thought that would be important to know, so if a tuning change needed to be made, I'd have some idea what his thought process was. We never got there though.