OK. I don't think anybody is understanding 89blazer's question. If you do just ignore my rudeness, but what his deal is, is he already has the TBI on his truck and he doesn't want to get rid of it he just wonders if the "TBI-Specific Performer" would be worth the extra hundred bucks. Can anyone who has a "TBI-Performer" on his truck tell him what it's like? Is it worth it or not?
OK sorry 'bout the rant but I'm sure he is a little frustrated too.
Anyways my two cents is to buy the 100.00 2101 "Carb-Performer" and see if there are any adapter/spacer type things to hook the TBI up to it.
Or you could fab up a spacer-plate and drill it for both of the mounting patterns of the carb and TBI, then cut, drill, torch, whatever out the space for the butterflies and TA-DAA!!, a Performer intake for a carb adapted to TBI with no mods to either. I feel like it would be well worth the time and there wouldn't be much cash outlay except for the mainfold.
Later,
Buddy
I've got my dream truck and it's a 72 K-5 that is getting there!!