The problem with the bell replacement kit is that it doesn't come with a critical piece, the pivot pin that the two blocks go on. It wears too and the best you can do is press yours out and turn it 90 degrees to expose new surfaces to the blocks.
I installed a Crown HD unit the other day and for the price, it was a huge improvement. The real u joints are smoother than the stock parts, though not replaceable if they wear out.
While it looks like it would work in a 74, The listings are 76 to 86......?
1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon