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Don,
They started adding stuff like start enrichiners, Should be the extreme hi V ign. Yes they all had 3 carbs except the racing 6’s, Be careful of the ign, Something to do with a different spark plug too. Remove if so equiped a top block plug & run it out the bottom, always know the top of the motor is getting cooled, Compression might be a suprize, bet they are over 10% diff. Whats the gear oil look like? No bushings, just roller & needles. My books go to 1965 is all, so sorry,
Jeff
Change the wires 4 the plugs & check voltage rating. Joe Poole has carb parts. I would do the complete fuel system, pumps & hoses too. Those old hoses screw up the tiny jets flaking raho to start problems like a burned piston runnning dry. That is just me I can enjoy a carb job for weeks & Mag too. Try to get them better than new. I was the only one in the hood that was running a Mac 6 on my mini bike @ 14.
Regards,