I can't find spark plugs for my SBC! I just fixed (I think) my Edelbrock carb by wiring full 12V power to the electric choke (from wiper circuit). I wanted to change out the spark plugs, because I suspected it's been running rich with the electric choke constantly closed. ~ looks pretty black, sooty, not too oily. Too rich? Need hotter plugs? Gap? According to my stampings, this is a '65 327cid SBC, but the plugs Autozone gave me don't seem to match and needed 13/16" socket. The old plug installed is 5/8" socket. (don't know if thread and distance are same.. rats, should have checked that) But, the wells for the plugs seem a little small. Someone here suggested one of the POs may have changed out the headers, so spark plugs may not be spec? How do I find this spark plug? or the best alternative? The only one that came up on cross-reference at A-Zone was this Motorcraft, which threads in nicely, but sticks out farther. In fact, I couldn't tighten it down, because my 5/8" socket wasn't deep enough. This is my distributor. Is it HEI? (how can you tell?) So, I don't need to worry about points, or dwell? Any idea what this random disconnected nearby wire is? So, the old Bosch Super plug looks gap'd around 0.035. If I have an HEI Distributor, I was going to gap 0.040 to 0.045? Does a bigger gap affect timing? Does that need adjusting? I'm assuming it's been rebuilt, so the original spec timing criteria don't apply anymore? As always.. THANKS!