I have both the 74-75 HEI (external coil) and the later coil in cap putting both side by side I see very little difference in the lenght. The problem of the cap jamming up against the side cover or block does exist. I've mentioned that in previous posts. Filing the cap is one solution. You can also reposition where number 1 is, by moving the distributor gear backwards or forwards on the cam gear. Then turn the oil pump drive with a long screw driver till the distributor drops in. It takes some trial and error, but you should be able to find a spot where you get at least 0-10 degrees movement. I thought this was only a problem with 292s.
Larry
