What size jets on 97 Stomberg?

[Roger/Sacramento]

I have recently been running my new build in a '41 Pickup on the road. A friend said that the exhaust smell was very strong when he followed me. What jet size should I use? Because they are not exactly cheap to replace maybe someone can get me close. I am at sea level.

276 cubic inches (1/4" overbore with Mercury crank)
Offenhauser 400 heads
3 Stromberg carburetors
Crab ignition
L100 cam

By the way I am using an unregulated new mechanical fuel pump and have not experienced any excessive pressure causing leaks.