Haha I realize this was a super general question. My thing is right now I'm just trying to get it running but the plan is to drag race it all next summer. It's one of those things I planned on swapping to a MSD 6AL2 and upgrading the whole system. But I had not really thought of running an HEI system because I didn't realize it was that easy to swap too. It brings in another factor to consider and think about.