I work on a couple of these & kevins correct- a brake line runs to the inching valve & it is controlled by brake line pressure. Try applying the brakes hard a few times- then make sure the inching circuit is activated when the pedal is released, then, while the inch circuit is still activated while the brake pedal is at rest loosen a bleeder & check if there's residual pressure that bleeds off. Check this at the inching valve as the brakes always have about 7 lbs of residual.

If there's residual pressure then either you have a faulty master cyl or the adjustment for the master cyl push rod needs adjusting. There should be free play at the pedal surface for this reason.

If the pedal is at rest- can you manually pull the pedal more 'off'? If- after you've pulled the pedal 'off'- does the inching system work correctly? If so then maybe the issue is the wood bent something or the pedal pivot needs lubrication- just a thought

2nd thought- what was wrong w/ the wheel cyl? Did you disassemble to diagnose or just replace. Someone may have fill the master cyl w/ the wrong fluid & unless brake fluid is used the seals well swell & stop things from moving as they should. I've seen this a million times