SCOTI, found your build. I have actually followed your thread for a while.
I was looking at the frames tonight before a little dust storm blew through and it sure looks as if the bottom half of the frame horn is the same between the 63-66 frame and the 67-72 frame. I am going to make a template to check for sure.
The rad. support is different but that looks pretty easy to swap out.
Suspension in front is the same and bed perches look the same.
Front cab mounts look the same and the rear mounts are definitely in need of swapping.
The grinder will come out soon and brackets are coming off.
I am going to need a box of grade 8 X 1/2" bolts and nuts to reassemble.
I am leaning toward the 3 step brush on frame coating.
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Building Genuine Pontiac Firepowered cars and trucks for several decades.
Why Pontiac?? That's just me daring to be different.
Projects..
63 C10
Short
Wheel
Base fleetside (The Pro-Street) currently under reconstruction.
440CID 2X4 Pontiac