Revoh,
It's probably the easiest core to replace that's out there. All you need is a 1/4" nut driver and a few minutes of your time. I'm sure you already know, but it's under the hood under the lid of the box that's mounted to the firewall, not in the cab like most.
Good luck,
Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!