You don't need a "special" distributor to change to HEI, just a good electronic Mopar distributor, a module, and an HEI coil. The eBay ad is like a snake oil salesman. Lot's of words, distracting you from some of the reasons to do this (in the minds of a lot of Mopar guys): to eliminate the ballast. Yeah, you can buy the distributor, get the module with it, but then you're left with the ballast inline simply because, if you don't get an HEI coil to go with it, you still need to run the ballast. You'll notice, he's doing a lot of comparisons to points, too.
I will say that I'm not convinced about the HEI conversion, though I know many are. We have a member on here who went that way with his '69 Dart daily driver and he likes it.
Personally, I've always had luck with the Mopar system. I've replaced a few ECU's, yeah, and a few ballasts, but I've replaced more modules on GM's which weren't running right than I ever had ECU's or ballasts. Many Mopar guys cuss the ballast. I know a lot of GM guys who cuss the module.
If you're looking for performance, then you'll have to upgrade the module, too. Most stock ones will fall flat at around 4500 rpm. Stock for stock, the Chrysler system puts out at a higher rev. This set up in the ad offers nothing on converting from the stock Mopar ECU, probably the reason he keeps pushing it over points.
As a matter of fact, and I say this just for comparisons sake, I've researched the best ignition system on my Ford pick up. The upgrade is go with the
Chrysler ignition system. Says something about the Chrysler system, in my opinion.
Don't think I'm trying to convince you
not to go this route. I'm fair. Here's a good write up over on slant.org for your perusal, though, so that you can do some research on the why's and wherefore's of the swap if you want to go that route.
http://www.slantsix.org/forum/viewtopic.php?t=15779
