I have new (that I bought directly from Rochester) 4-Jet carbs with manual choke that were designed for Palmer Marine 355 CID engines.

Been selling them to the "cheaters" with 350's for years (hey kid, its just a 283, look at the old style carburetor, lets see how they run! wink ).

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop