Re: Holley carbs on Motor Homes
In my opinion if you have a motorcraft carb and holley carb of similar cfm and they are both setup and tuned correctly for your engine then I don't think there would be alot of difference as far as economy goes.
I would expect one of the parts stores should be able to supply a carby kit for a motorcraft carb. There must be still a number of them on vehicles out there.
If parts are unavailable then your only choice may be to pop a holley on it.
71 429SCJ Mustang