Just bought this what do you think ?

Yah I know numbers matching is a vague term for pre 1968 mopars since they didn't stamp SN's on everything until then.

In any case he advertised it as being all original commando 273 4 speed 1964 dart

When in fact there were no commando motors until 1965, at least in darts.

and the fender tag said it was a 3 speed 2 barrel car.

The only way to check if something is "right" or original is to check the casting dates for consistency. and make sure that the fender tag is also consistent.

This car had a 1965 motor and a 1965 4 speed in it as far as I can tell.

It looks like it is a great driver and about a 30-40 ft paint job. depending on how good your eye sight is :)