Jerry - going to have to slightly disagree with you on the use of the Dual-Jet. Absolutely no disagreement on it being an excellent carburetor, and dirt-cheap (it is for two reasons).

Reason number 1 - documentation (there isn't any).
Reason number 2 - available tuning parts (there aren't any).

So if one were installed and the calibration was close, it would be a great carburetor. If the calibration is not close, one better have a really good machine shop, and know how to use it; or the Dual-Jet would be a door-stop.

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