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OK, great information here. Thanks everyone.
I went to the U-Pull yard in Denver and looked and looked. I found mostly 90 amp alternators but could not find a 120 amp. I finally found a 136 amp and pulled that one. Now the voltage regulator was another story. It seems like those are in high demand. The harness for those came up with a dead end.
I have the normal style regulator in my 65 D200 but it is one of the solid state electronic ones. It just has the same form factor and case as the old mechanical regulator. Will that work with the high amp alternator or do I still have to use one of the 70+ voltage regulators?




any dual field from 69 and up works with this one. Napa has the reg and the special connector for it.
Here is a thread with pics I did on another site from 10 years ago

130 amp denso alternator conversion

The 130amp denso from a dodge does fit a big block without having to move it. I had to use a nut and grind a spacer with my dremel but that was it.