HEI or Rev-N-Nator and several HEI questions

I've ran it off and on for about 4 yrs. it's now on my 65 dart 273 I haven't had a different box on 65 besides Rev to compare. I wouldn't say I notice much difference with normal driving. I like the box and would buy another. I also have an MSD 6AL2 and I'd rather use Rev box. Maybe a different route I'd look into is an FBO ignition I've heard good and some bad about them. But with the FBO it deletes the ballast resister. Dustin