I agree, adjust them after a 5 or 10 mile drive with the engine NOT runing.
on my '55 235 with solid lifters I use 0.008" on the intake and 0.015 on the exhaust. It is quiet but some people might adjust them tighter, I don't really like burnt valves myself...

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-