TH400 Slip Yoke

[C-Rat]

I am in the process of trying to finish my project. It is a 1967 Shortbed. I've had this truck for almost 2 years now and ended up having to put it on the backburner for a little while. I bought a 350/350 from a wrecked corvette and also had a 69 long bed donor truck that had a 305, 400 trans and dana 60 rear. Well we decided to put the 350 motor in and the 400 trans. of course the donor trucks driveshaft was too long(and please don't ask what happened to the original yoke) so I got a driveshaft but can't seem to find a slip yoke for this truck. It is a 32 spline with no threaded hole. I went to the local shop and picked one up but it was too thick to fit in. Any help with be appreciated!