Well guys, I Know the best route would be to get a 64' specific harness, but the $1500 price tag is a no can do, guess thats one disadvantage with having a pre 66' car.
Fixing the harness I have now may cost almost the same, as every wire looks like it needs replacing. The harness in the engine bay is soaked in gas, it looks like at one point in time there was a fuel leak around the carb and the fabric sheathing acted like a wick. Needless to say all the plastic coatings on the wires are so far gone they need replacing, I'm shocked the car hasn't burst into flames. The fuse box is a nightmare there are a dozen signs of shorts, burnt wires etc within 6 inches of the box, and don't even ask about the fire wall connector! Seriously this car should have exploded before now!
I had painless universal non-GM kit sent to my work so I could look at it, it is actually a well put together piece of kit! I'll let you know how the install goes as i'll be doing it on sunday/monday.