There's no way,in my opinion that a 1983 Holmes beats a 1973 Ali. Muhammad,the way he was in the second Norton fight,was way too fast for this version of Holmes,for a kick off.
I dont think Ali (honestly) take Larry in his prime vs. prime ALI.either verision of Muhamad 60-67,or Ali after exile. Larry is very underated,maybe because of his losses to Spinks and or ko by tyson.
As far as a fight between Ali and a prime Holmes goes,I would back Ali circa 1964-1974 to win. A Manila Ali would have a 50-50 shot. Holmes wins against Muhammad's incarnations pre 1964 and after 1976.