How many of us are there? Owners of Dodge based RV's?

Measure the primaries on your thermoquad, one inch is 800 cfm, 1 1/2 inch is 850 cfm, and the 1000 cfm is marked performance series. As I understand it only these sizes were made. I ended up with a 600cfm because I did not know this at the time and trusted the guy behind the counter. Although I have read on a carb web site that 600cfm is good for engines up to 300 HP.

Edelbrock tech support told me they no longer make a direct replacement, requiring an adapter from spreadbore to squarebore.