1967 C10 Door Closure

[terremd]

Hello all,
I just acquired a 67 C10 and I need advise on how to adjust the latches on the doors. The driver's side closes and latches, but rattles. It's not snug enough to the cab when it is closed. I can put minimal pull pressure while in the cab and the rattling stops. I loosened the striker but was leery of removing the bolts all together before I got some advice. The adjustment will need to be minimal, I just don't know how it adjust.
Thanks
Mike in Texas.

PS this was a true barn find (nice barn) it's a 67 C10 big 6, 4 speed with a granny gear that never left the property. It has 34K original miles on it. I'm looking forward to bringing it back. Original paint was oxidized some, but not gone and has wet sanded pretty good.