[jmarkaudio]

That should be a non-HP 1150 casting, the list number on top should be a 7320 or 9377 unless it was a custom built carb using a bare casting. If you can post a picture of the main body side of the metering block, I can tell you if it's 2 or 3 circuit. If it is a stock unmodified carb I would suggest getting it reworked, with the right mods it will work fine on the throttle stop. I have a pair of the old style 9377's one on gas, one on E85, both work fine on the stop. It should look like the 1050 in my picture below.