The HEI will fit and clear the engine and surrounding parts. It's close, but does clear (it's a popular swap for these engines). The work needed to mod one is not really any different than what I had to do to my current distributor, and it really was not that bad. I am pretty good at fabbing a modding. So that does not bother me. Now attempting to install GM guts into my current distributor would be a whole different ball game.
What measurements exactly are you wanting? Are you wondering if any other OEM distributor could be machined/modded a little to be a drop in? Or are you wanting clearance measurements from distributor to other items on the engine?
I am currently running the ford TFI style riser and cap on my stock distributor, and that puts it close to the same diameter as a HEI. It's not the best picture, but you can kinda see it here: http://img.photobucket.com/albums/v6...4-07182041.jpg
Doing some more google searching and reading. I think I may get one of these instead of the more expensive ones. http://www.skipwhiteperformance.com/...px?Item=6512-B
Most forums I read where people have used these from that place seem to really like them and have no complaints other than a a few here and there that most than likely got bad ones.
I have also been searching for what vehicles have the 7 pin module to see if I could source some cheap from a JY or buy new. It looks like the cadillac 4.9 V8's from the early 90's have them, and my local pull a part JY usually has several of them at any one time. So I should be able to pick up a couple of those complete distributors for really cheap. That way I could source the module and connectors, and probably a couple good pickup coils to use in the aftermarket AMC HEI.
At first I didn't like the idea of the HEI and everything (coil and module) all in the distributor and cap. But now that I have thought about it a little more, I think I am starting to like the idea. It would kinda clean things up on my engine a little. Right now I have the 8 pin module bolted to a large heat sink that is then bolted to my AC compressor. And the coil is behind that. Moving all that to the distributor would tidy things up some. I may hit up the JY this weekend.
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