I just happened to also be looking for a yoke for my oddball GM 5 speed trans. Its a 32 spline, 1.364" (34.6 mm) diam. (actual, common reference is 1 3/8") output shaft.
The yoke you seek might be fairly easy to find if my info is correct.
Look at the yokes for GM's TH-400, Muncie M-22 (Rock Crusher) 4-speed, and B&W (Super) T-10 4-speed, Lenco, Liberty, Jerico, G Force (Racing) 4 speed. Note a trend here? Heavy Duty Stuff. For a 1310 U-joint you'll want to look at Camaro / Firebird parts sources, unless you find a way of fitting 1330 U-joints at both ends.
Found it here:
http://store.trackerdesigns.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=Driveline
$200 for a "racing" part 1350 , but stock parts $5 - $20 at the JY or eBAY. $50 new from Denny's:
http://www.dennysdriveshaft.com/html/slip_yokes.html