'67 Dex-cool or Not

[Keating121]

Just got my first Vintage Chevy Truck!! Got it home, drove it to the coffee shop, stopped at several long lights, got there to see it boiling over, and looked orange! Made it home, figured the coolant was just nasty, added some 50/50 antifreeze and then thought, Dex-cool. I think it had Dex-cool in it, smelled like plain antifreeze?? I'm flushing the system now. It has a very new looking aluminum radiator. I'm going to go with a new 195 thermostat. Should I go with Classic Antifreeze or Dex-cool in it? Thanks!!