Computer(if you wanna call it that) is different (I happen to know a guy who probably has one) orrrrrrr you could just do a swap Harness all which should work fine(unless the engine in your 84 sucks<I would imagine it's a 1.8>). If you need a bottom end I happen to know a guy who has a 1.8 which is bored to 1.9 Lower with new pistons. It has been all balanced and is VERY nice just waiting for the 1.8 Big valve head or better yet the 1.8 16 big valve head. If none of that is your flavor I happen to know a guy that has a 97,000 mile 2.0 ltr aba motor Minus mani and throttle body(Mustang 3" just happens to fit PERFECTLY) that would love to live in a bunny. So yeah if you need another set wrenches ever you know how to get me. :)