I was asking the same question as you, but I came to the conclusion that I'm building a classic Mustang. They never had 16"'s in the '60's! So I have decided to stay with the 15's" Besides, I'm trying to balance out performance with everyday driveability. I've gone down a little in my cam selection, backed down to 15's, and I'm going to stick with a stock distrubitor with a Pertronics. sometimes we get a little carried away with what we would like vs. what really works and what we need. Myself, I had to take a step back and look at the big picture. Now if I could just figure out what headers to run!