Fresh 318 , the good and the bad

Hi guys , so me and my installed the new refreshed 318 , all new gaskets / fresh plugs / oil pump / sump / gas pump / nos oil pan / good cam + lifters and 4bbl + alum intake...the usual 318 build . The engine is in my ratty 68 fury , runs a stock 727 and a 2.76 suregrip . Car runs ok , llt better than the old tired 318 , but ive realized that it was running colder running at 900 rpm for 20 mins even on a very hot 85-90 degree ( 200f on gauge ) and when to 210 - 220 and 230 , never went more than that but it was only when i was crusing at 60-70 mph , or even whit city driving it doest the same , it will go up to 210-220 and left it park...it runs smooth amd stays at 200*, it never happened to me , for sure she had an old rad too, Might buy a cheap alum rad for this summer , Car has no fran shroud , just a tiny 4 blade fan , ive changed the rad cap and the antifreeze , helps a bit but i feel the cooling system is not its job properly, tought that 200-210 was high , im used to run in the 180* range with my duster's 360

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get it warm and feel areas in the front of the rad for cold spots... bet it's blocked up.. have had it happen a few times..

I used a ECP radiator with no shroud and a new 7blade clutch fan... motor never gets over 180..