After conferring with some the guys from my old unit, I will be going with the minigun, mounted on the left side. It turns out that the early models of the OH-58, weighed 400 pounds more than the OH-6, but had the same engine. Thusly, the lifting power was limited. It was also interesting, that when I posted the question, on our unit forum, 91 guys saw it, but only two had flown the OH-58, which is interesting in itself, as the OH-58 replaced the OH-6 in 1970. That ship does not seem to come into its own until after Nam.
Jim