Your basement is probably seriously pitched like mine for drainage so moving any game, even a few feet, will require some top and bottom leveling. I set mine at 6.7-7.0 depending on the game at the slings and then do my best to get the same at the highest measurable point on the playfield. It takes a while to dial it in (especially when you have to crawl under the game and turtle shell it while adjusting the levelers) but I have a JM (6.9 degrees) and that ball should be a lazy drop to the right flipper.

But it’s made of wood, as is the cabinet, so there is some play involved? If the rear left leg is 1/4’ lower than the rest of the legs there will be some pitch towards the left leg?

If both the playfield and floor are perfectly flat then yes, I completely agree. But the basement floor and undoubtedly the playfield are not. Otherwise my leg levelers on all my games would be the same.