So I have a rebuilt 4100 (65 1.12 model) on the car now. I just bought a Holly 1273 (needs total rebuild). I got the holly as a spare and was just curious about how the two carbs would perform. So I have a few questions:

1) How well do you think they will perform against each other? Pros/cons/power/mpg etc.

2) I have two adapter plates for a pcv valve. One is 1” and the other 1/2” both with openings at the back for the hose from the pcv valve. Which one is better? I will post pics of the bottom where the ‘grooves’ are tomorrow.

Thanks,

Mike