i need an overall opinion on a msd 6a

ok so i ran across a good deal on a msd 6a box brand new, but i want to know what i will gain from it? ive got a 360 with 9.8-1 comp. a 292-480 lift lunatti bracket master cam, m1 dual plane, 3.91's stock heads there like 73cc but i will be changing to j heads in about a month, 4 speed. i was talking to my old auto shop teacher and he swears by them, i do like the idea of a rev limiter but i dont think a 6a even has one, if im right you have to go to a 6al to get the rev limiter, so what do you think?