It resembles a B&S carb (as in the 6hp engines) in that a viton seat sits in a machined pocket,being pushed in by a drill shank or similar device. This is similar but has a groove that a type of snap ring goes into just above the viton seat,acting as a retainer.
Thanks for the replies and advice. I know Walbro makes zillions of carbs and there's one on ebay for a 89 15hp Chrysler. It looks roughly similar except for the choke lever.
I may try some more to fix this one. The F10120 kit has a snap ring,like mentioned above. I drove one into the bore. The viton seat can bottom onto it and results in putting the float at the proper parallel position. However,the bore is slightly larger in diameter so I'd need to find a way to fix it into position.
I think I have a number for a salvage yard.
Original Problem: It would bog at higher throttle most of the time but sometimes seem to hit max rpm. It has new lines and fp is rblt. Ignition (new points and condensers) looks good using an inline spark tester at all settings. Looking at the seat with an opti visor and light,the seat appeared a little swollen.