Post some pics of it. I believe what you may have is a 240 i believe it is. Or it may be a 260 i cant remember. Back in the.60s.and early 70s.many of.these.cars were.changed from the.stock motor.to th WV e mustang straight 6. They.were easier to find and had nearly 45hp gain so instead of.speandimg.the.money.to rebuild the.144 or the 200 they were. swapped.i hope this.helps plus the.parts are.interchangeable