Four degrees is probably not going to be a problem (did you ever drive up or down a hill with more than 4 degrees?). Of course I can remember Dad talking about having to back up steep hills with the Model T (gravity feed) as it would run out of gasoline!

Some of the marine suppliers do have adapters, but I believe they are in the 10~12 degree range.

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