727 slip yoke on 7 1/4 driveshaft

Hello, I'm in the midst of my 340 swap into my 1974 Dodge Dart, trying to reuse as much as possible since I don't have much money so I'm keeping the 7 1/4 rear end for now and I'm trying to reuse the driveshaft, I've ordered a new slip yoke that mates to the trans but I'm concerned it won't mate to the driveshaft since it uses a 1350 U joint, is there a way to get the driveshaft modified to accept that u joint?