I think the strip dominator was on the market from Holley well before the M1.
I always thought the m1 was a clone or refinement of the strip. I bought a w2 Strip dominator in the late 80,s when it and the dual tunnel ram were the only good intake for those heads back then. Kind of like the w5 and the Indy 360-1 are refinements of the original w2.
Way back I was told that Holley was making the M1 for Mopar and it was the same intake…could have been total BS…strangely the only M1 single plane I own is the one for the V6