I can help with 2a. but not a clue on the other questions.

Then and Now Automotive can rebuild either pump for you, or sell you a rebuild kit so you could do it yourself. They may be able to help you ID which pump to use.

I'm gonna guess that either pump would work fine on your truck.
Any stamped numbers around the screws holding it together? That's how I ID'd mine to get a rebuild kit from Then and Now.

[on edit] Looks like Jon types faster than me. Hot here too, yesterday. Got all the way up to 70F. wink

Last edited by klhansen; 06/26/2023 11:19 PM.
Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.