Not negative. The spread stuff never ran like it should have on motor. Now I think the spread stuff is helpful (ish) if you are going to run an ass load of spray, but even then, there doesn't seem to be much (If any) performance advantage. Velocity over volume still prevails 90% of the time.
True sir.
It is VERY soft metal, a file will do the work in short time. Also be careful as the drill bit will want to just fly right through it. Put a broom stick or the like in the carb body so the drill bit doesn't damage the other side.