Howdy Blake. Yup you scored big time.
The red Chevy is a 63 as you thought. One year only grill has good value. The GMC is harder to tell its year. It also is a 63. the 62 and older had a hydraulic clutch, this one has a linkage type. And the new for 63 engine. 64 and newer had the flatter windshield with the slope back "A" post. 66 had the new GMC letering in the grill.
Do I dare mention the nice 66 Canadian Mercury custom cab.

You will find lots of help on this site, a great bunch of guys and gals.
Have fun, Howie in Gleichen Ab. with a 55 one ton & 62 C-10


1 1955 Chev one ton. 261 engine

3 1962 Chev c-10 261 engine
4 1966 Plymouth VIP 5.7 GenIII Hemi
5 1966 Imperial Crown Coupe 440 engine