[BorisK]

Thanks again for all of the help. Remanufactured 57 distributor is very reasonable. Can you elaborate a little more on the process to convert the carburetor to mechanical advance? Is it as simple plugging the vacuum port to the distributor diaphragm and putting a plug in place of the spark control valve? Read a little last night, it seemed it may be a bit more complicated.

I've seen a number of new 3 bolt 2 barrel carburetors. Although you don't recommend it, it seems it might be a good solution. The only thing I'm concerned about is that all of them are rated for about 200 cfm. I've done the calculation and I think this is what is required for the 239.

(239 cubic inches)(4200 max rpm)(0.7 volumetric efficiency)/3456 = 203 cfm