Hey guys, I am trying to do my points to HEI swap on my Jimmy and have some questions. And yes I did a search /forums/images/graemlins/grin.gif . First of all, I got two distributors and one cap from a buddy of mine from his vast pile of stuff. The cap is clearly an HEI cap. However I have a question on the actual distributors. Both have the harness that plugs into the cap. However, one has the 4 wire harness that I believe is for ESC. Is it even possible to use this distributor on my truck. I know you can put non-ESC distributors on ESC trucks or de-ESC your distributor (with some splicing) but could you (if you had nothing else), put a ESC distributor on a non-ESC truck? Second, how can I identify the other distributor as an HEI distributor (the rotor, housing, etc)? I want to make sure it's not another points distributor before I pull my current setup. About my current setup, I was looking at it last nite and apparently a PO added something. I have this box: Box pic on my firewall. It has four wires connected to it and they are the 2 wires from the points distributor and 2 wires from the coil. That box is all the distributor and coil are connected to (although there is a good possibility I accidentally pulled a poorly spliced wire last nite while sorting through it all). If anyone can tell me what this is and if it will affect my HEI swap, I would appreciate it. Last question is basically on the install. I know it's a "drop in", but I don't want to screw up my timing (if that's possible). The cap only goes onto the distributor one way from what I can tell thanks to a little tab, so that's fine. But how do I line up the new distributor and cap to drop in? If I was just pulling and replacing the existing one, I would mark it all, but I can't do that here obviously. In other words, how do I make sure the "cylinder 1 terminal" on the cap and the rotor are in the same place as they were on the points cap. Does the oil pump prevent me from lining that up incorrectly? Thanks!!