Yes the main jet on the 292 is usually larger than a 230/250. The throttle bore is also larger by about a 1/4 of an inch too. There's a 40 CI difference in engines size. The jet and throttle bore aren't going to cause the fuel to percolate in the fuel bowl.

Did you put a phenolic spacer between carb and intake manifold? If not try that.

Larry


I don't own a vehicle that isn't old enough to drink.