Hmmm...I dont know. I do have one on my tool box that I bought last year for my truck, but since I dont have an adapter gasket, I havent put it on...I am pretty sure all the linkage is fine, my only other concern was that the connecters on the Holley TBI are different than my 89 5.7 TBI.
I know there are a few on here that run the Holleys, so maybe they will post up.
Rob