I like your shroud, is that one of the universal sheet metal ones? I tried to install the 5" version on mine but it was too wide, should've measured...
I don't think you're running hot if the needle is past the middle of your gauge. My understanding is the on the older rigs only tells you when it's warmed up. Mine runs about halfway between middle up to all the way right and it's never concerned me. I've never had signs of overheating at all.
My cooling system is on top shape too - recored original radiator, new water pump, new stock t-stat, flushed block, fresh coolant, etc.
It sounds to me like your 327 is running where it should unless you're seeing signs of overheating of course.
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1968 J2000 - AMC 327/T18/D20 (twin stick), stock D44s, 3" body lift, 35x12.50 Goodyear MTRs w/ Kevlar