Yep, I'm a Holley guy and I've got to agree Glacier....

That being said, my WB 4.2 is totally standard with a genuine 218,000kms and a 4bbl Rochester and it starts, idles, and appears to be running on just about a perfect mixture, so I'm happy to leave it alone as long as it keeps playing the game.

I've got an LX Torana with a worked 4.2 and a 2bbl 350 Holley and it flies, so it seems a lot of carbies work on 253's.....