Traction Control Needed...

first of all - nice car! I like it a lot! now.. - did you just say you are driving around on 30yo tires!!!??? YIKES! It be time for some new sneakers!! Those old wheels and tires just aren't going to get you where you want to be. You're asking a lot of those old wheels - limiting yourself to a 14" tire is probably not ever going to get you the gription you are after. It also appears you are still running the 4"bp - also a limiting factor as far as wheel choices go. The weight of the steel wheels is slowing you down too - especially up front - you have to decide between some performance up grades and the look you want though.. so - - - . Anyway - I had a 71 Scamp back in the 80's that I put 15" x 6" (or maybe they were 7") Cragars SST's on all the way around and a set of (then) lower profile 60 series tires on all four - it effectively lowered the car and made it both a little quicker and handle better. My advice on this one - get in touch with a local tire shop and talk to them.
GOOD shocks will help too.
There are some other things - pinion snubber, sub frame connectors - but that might be getting more involved than you want... ???