My '71 Scamp 5.9 magnum swap.

Infecteddog said

360s had regulatorless rails and GCs and Daks didn't have 360s until '98.

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I have seen 5.9 with regulator rails in Ram, and lots of 5.2's had them in Ram and GC. I know the GC only had 5.9 in 98 limited. The point is that its easy to find a regulator rail and eliminate the need for aftermarket one.