I'm running 100 amp PowerMasters in both my '66 and '69. They can be a challenge to install on a SBF, though, as they often come with the post located in such a way that it hits against the block when everything gets tightened down. I've seen some that were easy to "clock" it the other way to get it away from the block, and some that don't have enough wiring inside them to do it. Those ones take some extra work to mount (ala the one on my 408).
I went on a 3G alternator kick a while back. I used them from 96 Mustang V6 cars though you can find them on Tauruses. Genuine Ford and they put out 130 amps. Not exactly "1 wire" though, you need to run an "exciter" wire to a dash warning light. I like having a dash light anyway. I get them from 96 Mustangs because you need the plug-in for the alternator from a donor car. These unplug from both ends on Mustangs where on other cars you have to cut the wires. Some salvage yards don't like people cutting wires. I understand somebody is selling new plug-ins separately these days, and of course you can grab a new or rebuilt alternator at any parts store. I've had good luck so far with used ones. Put one on a 200 six Mustang (why not), SWMBO's '86 Mustang (to keep up with electric fans), my Bronco (because the 2G could never quite keep up), and a friend's 68 Mustang.
I paid no more than $35 for any of the alternators, no extra for the small bit of wiring harness. I like 'em.
The product page lists several reasons why he thinks this setup works better than a 1 wire setup. Mine has worked perfectly. The instructions that come with the kit will list several GM alternators that will work depending on the amperage and setup of the plugs you want. It was a very easy install.
I also got this bright headlight kit from him to help solve the dim headlight problem with these older cars. Here it is:
I'M ALSO USING MAD ELECTRICAL SYSTEM WITH A GM ALTERNATOR, I HAVE THE BATTERY & SOLENOID IN THE TRUNK, RELAYS FOR MY NOW "BRIGHT" HEADLIGHTS MOUNTED NEAR THE RADIATOR. ITS A GREAT SYSTEM AND AS A SIDE BENEFIT I HAVE NOTICED BETTER PERFORMANCE.