The lane conditioning rule that people are referring to was not introduced until 1975, and was still in place in 1982. It was a bad rule because the technology, nor the knowledge existed to properly construct such a rule It was also the rule that spawned the biggest mis carriage of justice most of us can think of in the rejection of Glenn Allisons 900 series.
The ABC had no idea of the implications of the change from lacquer to urethane lane finish. I learned on lacquer, and getting to the pocket was dead easy, partly because we didn't have the down lane friction between ball and lane surface. Carry was usually more difficult for the same reason. You couldn't just rev up a ball and find the friction to make it hook on the long oiled lacquer.
When urethane lane finish came in, the oiling patterns used on lacquer produced a mess. Oil was pushed off the heads and moved down lane rather than tracking as it did on the softer lacquer. The fist answer to this problem was to put more oil in the heads and strip the back ends more often. This technique was combined with putting little or no oil outside to build a track that would not develop in and of itself. Softer polyester balls reacted more strongly to the artificially created dry areas, allowing the development of the power player who could now rev up the ball and find more down lane friction.
Lane blocking is as old as the game, but it became much more predominant with the introduction of urethane finish. In addition the scoring disparity between blocked and non blocked lanes became much greater on urethane than it had been on lacquer as softer polyester balls were introduced.
I remember bowling pot games ( really dating myself ) on lacquer in a house that was walled off the corner in 1967. I was not a good corner shooter, but I could play the track at 15 board and compete with the house full roller guys who specialized in the corner shot. 5 of the 7 houses in my city employed lane conditioning methods to help scoring even prior to the switch to urethane in the early 70's.
Another thing people don't understand is that the older soft lacquer finish did not reward the higher friction balls the way urethane could be made to. The last ABC bowled on lacquer was the 1975 tournament in Dayton OH. It was also my first ABC. I shot a very respectable 1860 all events with my new carmel white dot. I watched Bobby Meadows win all events throwing a black diamond. Right beside him was a guy scoring almost as well using a super soft Shore D, playing about 3 boards deeper.