That TSB is quite valid for the GT-E carburetor. Joe did that to my carb the first time around, probably 1994 - ish. I never ran it any other way so I have no idea about how that would have been but likely not as good. Initially (1994 - 2002) I had the factory MR intake and C3AF carbs, headers, wild cam etc. It was fun but the PSMCD is more fun so it’s stock now.