18 spline A833
You can also get a drive shaft built that uses a slip spline on the shaft like many 4x4 applications. Not a thing wrong with that angle, either The problem with ball and trunnion anymore, is getting parts Ball and trunnion are called a "Detroit" joint for reasons I've forgotten
Here is a hit on the key piece needed to do so
Dana Spicer 2-2-349 Flange Yoke 1310 series to replace Dodge Ball and Trunion Pot Body with 3.625 diameter mounting
Dana Spicer 2-2-349 Flange Yoke Replacement for old Dodge Detroit Pot Body Style Ball and Trunion Driveshafts 1310 series 3.625 pilot diameter