that is very expensive to fix my friend.
1. you need to toss the 4ac in the bin(or in my direction for parts)
2. you then replace the 4ac with a black top 20v.
you upgrade the brakes. suspension you should be fine.
get the thing up and running, and then show your brothers what power is all about. none of that ae92 100kw crap.
WiLo