Hello, I used the search for a while but couldn't find what I was looking for. I just put a 3x2 set up on a SBF with Holly carberators. I'm having a hard time getting it tuned up and a very knolegable friend of mine told me not to use a distributor with vacuum advance on it. It's a brand new pertronix dist on there now and he said I should replace it with a dist with mechanical advance. Is there any logic behind this? Thanks!