I have mechanicals (4782,4783) on mine. No problem on the street. You will have to make fuel lines and linkage unless the carbs you find come with them. I had to make 3/8" thick spacers to go between the carbs and the aircleaner for fuel line clearance at the front carb.

I have No idea how streetable the Modman intake is.

The Ford mechanicals are significantly smaller than the 4782 4783 carbs. Might work great on a small engine.

Barry Grant also made some mechanical carbs that were a lot smaller.