I am currently running a model A tillitson carb, but on a tour it is too high and I run out of gas after about 3 1/2 gals.. what is the best model T carb to use?? thanks tim..

I believe the NH is a good cab. I also run a simmons super power. Have run it on two different cars. One liked it and one did not. The simmon is a hotter carb power wise but it likes to drink the gas.

Get a good NH and clean it up and install it.You will get get good overall service.
There is alot of options for carbs,and some may perform better overall than a NH but cost alot more and parts may be more scarce or exspensive.

I second that. You can find a decent NH body for $20 to $30 at swap meets. All the parts are available, and it's uncomplicated.