(1) Pistons having wrist pin bores that intersect the oil ring groove have a reputation for burning oil, but 2 quarts in 750 miles is more than normal for that situation. I am also told that with the proper ring package this can be avoided.
(2) The second rings installed upside down would make the motor burn oil like that. The solution is obvious.
(3) I've seen guys punch holes in the roof of the intake ports when they are chasing threads in the rocker arm bosses with a pointy tipped tap. When the engine runs it actually sucks oil past the stud or fulcrum bolt threads and into the intake port. The solution is to apply a dab of epoxy in the bottom of the boss and plug the hole, or apply oil resistant thread sealant to the stud or fulcrum bolt threads.
Good luck solving the problem
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