I am not sure why there are not more Mustangs
done in the PT/G machine style.
Obviously there were MANY more 65-69 Mustangs built than there were 67-69
Camaro's.
A couple of drawbacks to the 65-66 Mustangs is that tire size in the rear is limited to about a 255 (some of gone bigger but it is a stretch!)series tire in the rear w/o going with a mini tub. Also big block motors don't fit in the 65-66 cars w/o shock tower removal..
On the other hand an advantage that the 65-66 Mustangs have is that they are much lighter than their Camaro counterparts. Usually 400-500lbs. depending on options and modifications
Personally I am happy that PT Mustangs are more scarce.It makes my car stand out
Scott