car runs warm now

Hi, I have a 1979 corvette that I bought to restore. Car was not running well but no running hot problem. Replaced heads because one valve was bad, installed summit alum intake, new radiator, water pump and clutch fan just for good measure,also running hooker side pipe headers and new quadrajet from Jegs so i can retain all stock functions. Seems to run at normal temp until i drive down road,still have not reinstalled hood yet,is that possibly the problem? Any insight would be helpful. I have been a tech for 30 years,as a master but have never seen a problem like this. I even tried a different water pump in case I had a reverse flow pump. p.ps runs about 195 at idle but hitting 220 driving down road ps has a 180 hd t-stat thanks.

Baffled Tech

Chris Trautman @ Corvette Assembly Plant 2019

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