According to Archie Moore himself he had little input in Foreman's style until Big George came back in the 80's.
there was a programme i watched on the Rumble in the Jungle and Archie Moore was with Dundee and Pacheco going over the fight in between rounds and anaylisisng it. Moore said that he was telling Saddler what to do against Ali but he wasnt being listened too
Blackburn wouldn't have George winging wild shots like he did against Frazier and Norton before it caught up to him against Ali, Lyle, and Jimmy Young. Foreman would definitely be a better overall boxer with a much sharper jab and more endurance. Under Blackburn, I could see George using a little more footwork and defense as well.
Blackburn might have been able to shorten Foremans looping punches and tighten up his defence a bit ,but you cant put in what isnt there, imo.Just as Blackburn could not give Louis quick feet ,he could not give Foreman speed or great head movement. You can polish a rough diamond ,but you cant do anything with a lump of rock, except try and smooth off the rough edges.