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I am running one in a 30 Coupe. I have played with Zeniths and Tillys and started to run Zenith Model B's to get just a bit of more power for hills. I have picked up several MS carbs at swaps but dismissed them as a touring carb and never tried one. Then I picked up a NOS Marvel Schebler brand new in a Firestone box with a $7.50 price tag at an antique store once that had the instructions, etc. all with it in the box. It was way too nice to put on a car so I cleaned up another one that I had and put it on my car. I was impressed with the big increase in power and top end. It never has a tendency to stall and will idle down to a tick. If you turn off the fuel shut off it will run for a long time as it has a bigger float bowl.
In talking about MS carbs with folks it was discussed by some that by a few short years after the last Model A was made, all of the newer cars where a lot more powerful and speedier. If you were one of the "hangers on" to your Model A in 1935 and beyond you were suddenly on the faster roads with faster cars. So you then went to the Western Autos, Sears, Firestones and started to buy your "speed equipment" to try to keep up with the modern faster traffic. That is when you could try out a Simmons carb or a Tilly or even the Marvel..
Some of the replacement spare parts are again showing up for these old MS at Renners....
