I bought an NOS one at least 10 years ago and installed it. It works great. You pump the fluid with your foot and it does as well as a modern unit. You probably already discovered that the hoses are rock hard but a quick trip to the auto parts store will get you going.

Go for it! It is not going to "wear out" sitting in your truck.
Kent

1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix