Depends how well the two of them can work as a team but I can see Tyson starting fast and taking out one of them quickly leaving the other one to try and fend off Tyson on his own which probably won’t be long.
Archie would be tricky for Tyson, but he would tire him out with his punching power and agressiveness. Similary to Marciano, with less workrate but more precise shots.
Tyson would overpower them and pretty easily. You really don't want to be a natural light heavyweight coming up against Tyson.
There isn't a light heavyweight in history that has any semblance of a chance against Tyson. Period. Tyson obliterates Moore and Johnson. Charles too.
Archie in the early 50’s before he started having problems with his weight would beat Tyson, but by the mid 50’s when he started coming in heavy, which was most likely due to age and years of bouncing back and forth between light heavyweight and heavyweight would get stopped by Tyson. Harold Johnson definitely has a chance of outpointing Tyson if he avoids getting clipped early, but if not Tyson would knock him out.
I think it speaks volumes that one of the best light heavyweights of all time lasted all of 91 seconds with Mike. To presume that Moore could do a whole lot better is pretty bold. Archie gets smoked quickly and easily. Mike is very underrated on the classic forum.
To be fair to Michael Spinks he went into the fight with two shot knees, came in at career high 212 lbs, and was also coming off a year of inactivity. Even Iron Mike himself was harmless with one bad knee when he fought Danny Williams.
You compare peak Archie Moore to this version of Spinks? I don't think it's fair to Old Mongoose. I can see Tyson beating Moore inside 5 rounds, but betting on first round KO is silly as they rarely happen at the highest stage.
If anyone could blast Moore out within one round, Mike Tyson would be the man to do it. It's possible and could very well be the outcome. I'm not betting on it, though...