Welcome to the forum from Ontario Canada..... you'll be able to tell if Mach from the Vin...along with engine code and so forth.....best advice get a Marti report
a shout out from MY VAN.....down by THA RIVER!!!!!
First we need PICTURES. it goes a long way in helping us understand what you have or doent have and along with body codes from the door and serial we can point you in the right direction. oh and we have another site group called 71-3 Mustang talk POST IT THERE and everybody will help you out. Welcome!!!