there may be a "ready-to-run distributor" for the slant that gives you HEI in one small package for ~$50. Search for that on ebay. Currently only for Mopar SB and RB engines.
Nope. Not only is it not actually HEI (which refers specifically to the GM ignition system by that name) but it is in fact no-name Chinese garbage. None for me thanks; I'm driving. At least for me, the idea is to improve reliability, not worsen it or take a gamble on parts failing that you can't get at any wrecking yard or parts store because you bought a whitebox Chinese distributor instead of using real parts designed by real automakers for use on real cars.