My 1st reply went poof, maybe because I included a link?? Very frustrating.
Anyway amuller, if no one comes up with an original you could make an adapter plate similar to the one in the 1st picture (courtesy of Frank R. I believe back in the day before he retired from making stuff).
Some guy on ebay is also selling a fabricated version that I recently bought but haven’t tried yet. But it seems to be able to do the job just fine. I won’t include the link this time, just the screenshot of the page and if you want it you’ll have to search for the item manually.
For anyone reading this he also makes them for the 7-1/2 HP making it much easier to convert those to a fuel pump, rather than having to go in behind the manifold and mess with that.
I personally like the pressure system but I have converted a couple for myself and converted for others too.
