Get the latest one you have $$$$ For.
Believe me when I'm telling you that the older Mustang would be great if you have the know how and tools along with a place you can work on the 65/66 Mustang to get it safe and roadworthy.
A disc brake conversion on the front is a must have.
Probably a new gas tank right away.
A later model fuel pump that ethanol won't eat up as well as rebuilding the carb and using parts and gaskets the ethanol won't destroy.
If it has been sitting for a long time you really need to be sure the engine, Transmission and rear won't need work. All the wheel bearings need to be repacked. A lot of other things need to be looked at and replaced.
That 66/67 is great for a project at the $1,200 asking price but not really great for someone that is going to use it all the time.
This 1966 Mustang
sat in a Garage in Florida
for 4 1/2 years and although "NO RUST" it sure needed a lot of work & $$$$ to get it safe and reliable.
2012-candy red- V-6 MCA, Automatic Trans. CFM Valve cover breather. MMD blackTail light trim.Magnaflow axle back street mufflers, JLT oil catch can.MMD hood struts.
Airaid Cold Air intake. red caliper covers, 3.7L performance engine cover, Flat black hood spears.Boss 302 strut brace, CDC rear panel, Trunk Cargo net,--Dash carpet cover,
Viser stickers to cover ugly yellow warning crap,Aluminum driveshafft and Swarr Bar.