[Eljaro]

Before switching over to Webers (I would never, never go back) I also had problems with my 850DP Holley. It would diesel or run on when turning off the engine, it would stumble when taking sharp corners, it would die when breaking hard, etc. I think that the 850 cfm is too large for the engine, and that a 750 would have run much better in the 427 cid engine.
I had ordered a 750cfm Holley DP to do the change, bit never had a chance to try it on, because the Weber fever hit me and there is now way back now.