I just finished a 72 K10. It was a fun project and VERY easy compared to 911's. Parts are cheap and available from a plethora of online source (e.g. LMC), even junkyards, CL, etc. A new GM 350 crate motor with warranty is less money than rebuilding a 915 tranny.
I have PS, PB (disc fronts), and A/C. It's no 911 canyon runner, but I love driving it and get thumbs up everywhere.
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Craig T
Volvo V60 - Daily Driver (I love it!)
997 Turbo - FVD Exhaust, GIAC Tune - 542 dyno hp on 93 oct
1972 Chevy K-10 Pick-Up Truck Hugger Orange