74 dart rear end in a 64 dart ,7 1/4 will it fit

Yes, it will fit i.e. bolt to the leaf springs without having to move the spring perches. However, if it comes from a 74 /6 car with all drums, odds are it will have SBP axles. To be sure, please measure before you sell so as not to mis-lead the buyer. It would be a bummer to think I'm getting a BBP axle when in fact it is a SBP.