The short answer:
There used to be, and maybe still is, a company in California called Trans-Dapt that made the adapter.
The long answer (or to quote Paul Harvey, the rest of the story):
Several years ago, we read/heard/whatever the same thing about replacing the Stromberg with the Holley. Since we own what is left of Stromberg, we had customers asking about the swap. So we bought 6 of the adapters and 6 of the Holleys; and sold them all in the summer. During the summer, all was well, except the gas mileage decreased dramatically from the Stromberg, but the trucks ran OK. And then winter came, and to start the trucks, the choke must be used. And every miserable one of the chokes BROKE on the Holleys. We had to take every one of them back and refund the full purchase price! And since they were broken, Holley would not take them back from us. Worst financial decision I have ever made!!!!!
I threw them all in a used 20 gallon garbage can (literally) and sold the can and its contents for the price of a new garbage can to a circle track racer.
So make the change if you want, but I would highly suggest rebuilding and keeping your original Stromberg if you want to drive the truck in the winter!
Jon.
