To add to this information , the 426 hemi was dominate during the 1964 nascar races . It was banned because the engine wasn't available to the general public. The same reason fords 427 SOHC engine never got to be on the track.
This is what started the rule that at least 500 cars had to be built...
Yes it would be the same as a Mustang. Just like the 390 or any other FE style engine , 352 , 360 , 390 , 406 , 427 , or the 428.
The OP's car is a great looking ride.