Grieg - there are many universal replacement carburetors that have been produced through the years.
Two issues to remember:
1. The RAKX-0 is a "cross-flange" carburetor. If you draw a straight line between the two mounting bolts, that line would be "fender to fender". A "straight-flange" carburetor would have the line going "bumper to bumper". As virtually all universal carburetors are straight flange units, a 90 degree adapter will be necessary. Some vendors can supply the adapter, but one can easily be fabricated. Visualize the capital letter "H". Lay the H on its side. Rotate one of the legs of the H 90 degrees. Drill holes in the 4 ends of the H which have the same dimension as the flange bolts. Install the H between the intake manifold and the carburetor, and you have rotated the carburetor hookup 90 degrees.
2. Virtually all replacement carburetors are set up for an electric fuel pump of 2~4 psi. The original was set up for a vacuum tank. The carburetor MUST be modified internally to use the vacuum tank OR an electric pump should be fitted.
Three of the more popular universal replacement carburetors are:
1. Zenith 68 series
2. Stromberg SF and SFM series
3. Carter BB updraft series
As all of these are made in multiple physical and airflow sizes, it is important to discuss your needs with the vendor.
Jon.
