i've got to say...the best 1bbl ive ever used was my modified one...its a YFA...good carb but not very good for power and not quite an economy carb...but I bored it out and rejetted it and played with the accelerater pump and all that fun stuff...it still needs work, but its very very good still, Ive tried a few different carbs (YFA's, RBS, Holley) holley was very nice, the Carter RBS was too, but not as mechanically good as the other carbs...still though...the modified one is my favorite, and i have gotten extremely upset about it when it wasnt running properly...
If u are going to do stuff to the carb, i would recommend getting that gasket material...I've had to make quite a few sets of gaskets as i was always opening the carb up and stuff...I dont think u can get premade gaskets except from a rebuild kit...thats what the auto parts guy told me. so have fun with that.
