950 Ultra XP tuning on 500"

we want what we pay for.

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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.