hi, I have a 64 Plymouth valiant,
ive stripped it down and re sprayed the whole body.
only now I have an issue with fitting the convertible top,
I cannot for the life of me work out where the two large springs to make to top easier to lift up go back and its really staring to annoy me.
Your best bet would be to find a 1964 Valiant service manual online. I have a '66 manual, but apparently '66's only came with the power top, so there is no information in it.