1965 A body 4 speed ball and trunion to Slip yoke ?

You can have a conversion driveshaft made. It’s detailed here: Early Valiant Barracuda Club - ball and trunion U-joint conversion

I recently had one made at Driveline Service of Fresno. Big Mike is the guy to talk to. Mopar guy, and knows exactly what needs to be done. I’m sure you could find someone for local, but this shop was great. Offered to ship mine to me, too.