Got the correct caliper installed on 1941 Ply Street Rod (front clip is 65 Valiant) and my brakes are working great now. Thanks to all who chimed in on the issue.
All I can think off, as all the parts were purchased at the same time, is the left front caliper was not the correct one and boxed improperly. I actually ended up with a 78 Volare right front caliper and a 80 Volare left front caliper. The left front was not bleeding the air off properly.
No one to blame but myself, I just didn’t see it. The joys of our cars.....
moral of the story, 78 Volare front disc brakes will fit on a 65 Valiant, if you have all the correct parts
Ollie