Transmission input shaft change?

[bails85]

i wasnt meaning to dog ya. i just figured 53 is a classic why not keep it that way.

[blackZZR]

Problem with classics is sooner of later you have to do something to destroy that classicness.
I see plenty of guys upgrade brakes, and no one complains
Putting a new engine in classic trucks has been a well respected swap for years. I think this is a very well thought out swap.