dyno numbers from my 340 just for reference

well after all that took the car on highway about 25 miles good beating put on it 80 mph plus and never got hot.
I pulled lower line to flush it when i got back no rust came out so i think i may have the problem licked.
Im going to refill with coolant tonight and do a 50 or 60 miles highway blast and make my call its 91 here now so if it holds steady today i would think im good