swapping to a jeep input shaft is the only way to go! As of today i can do swap for $54 shipped to my door from summit racing! the bearing is just a A5 timkin, 1975 chevrolet c10 wheel bearing $5 at oreily's! total $58 and some time! last one i ordered was $82 delivered, overpaid by $24! check it out or spend $150 delivered for adapter! i know for $50 i can build one and that includes the 3" hole saw. Here is youtube link of my buddy building one for his 1932 chevrolet truck!
https://www.youtube.com/watch?v=zYyNJnFc4rE