Yes they are extremely tunable, just about everything about them can be adjusted. And like I said, most of it needs to, for this application. Webers are very picky too about everything being just right. Dellortos would be more forgiving and easier to tune.
Everything said and done, I feel that they would work ok in a high performance application where low rpm performance is not important. That is not what the OP was asking for... Very short intake runners, which they are designed to work with, would probably not need heating. They would warm up from the heat conducting from the cylinder head. No plenum for fuel mixture to sit in.
