No, really. I'm thinkin at least 12................ Myself, I didn't learn until about 1970 that you don't need to "gamble" on "180 off" My first car, a 57 Chev, I didn't even know there was a "correct" distributor orientation. I just threw it in, cranked it until the oil drive dropped in, then brought up the marks and plugged no1 in wherever the rotor pointed. If it backfired, I turned it around. I pulled into a gas station one time and the jock told me "it can't run the timing is all off." "How can you tell?" "The plug wires are in the wrong place" Well I DID drive it in there, and I DID drive it out!!!