I have the ability to get GM licensed full quarters for my 64 from Goodmark for $400 to my door. Are there any better deals? I have also heard some bad stories about the fitment of Goodmark parts. Any trueth to this?

If you can get BOTH quarters for $400 to your door i'd say thats a steal!
I paid roughly $750 to my door a few years ago.
I'm sure the cost would be higher now.

I was a complete newbie when I did my quarters and they came out very nicely.
The fit wasn't perfect but it was very workable.
Just keep an eye on the gaps.

As in numerous posts on this forum, Goodmark is only a warehouse and does not make anything. All of the parts come in to the US via Tiawan. Most of the sponsors on this site carry Golden Legion or Dynacorn sheet metal. That is a good price though.