[ZeGermanHam]

Yes, your engine temp is too high. There's probably a 1% chance that any sort of parts-store flush product will help in any meaningful way. What is the state of the rest of your cooling system?

After I overhauled the cooling system in my '66, it went from constantly overheating in slow moving traffic to being able to idle for as long as you want and never getting above 190F. I replaced my old clogged radiator, installed a fan shroud and HD fan clutch, high-flow water pump w/clearanced divider plate, and a smaller A/C water pump pulley. No more overheating.