Ok good news they are kinda considered mopar in the USA and parts are available for them in the usa, bad news, they arnt as common as a chevy or ford.
just a few quick questions, sorry for the obvious sounding ones.
1. is the handbrake actually off (slack cable and adjusters off), and is it in neutral, not park.
2. have you tried towing it backwards?
try putting a bit of pressure on backwards and hitting with a hammer, otherwise its wheels off and hit drums with a hammer. to be honest ive never had a car that didnt come off by being jerked backwards.
Doh I just read the new bit, glad to see it finally released its hold.
Looks a really decent start to a project.