Mix ratio should be 50/50. I think my 95 SE had the pink stuff.

I wanted to do a complete flush on my series I motor and put DEX-COOL in my radiator. Is this legal?

Should be legal as every time we go to Valvoline to get the wife'* van an oil change, they want to try and sell us the flush and refill. I know the stuff is pricey (Dex Coll here at the parts store I was in earlier tonight was $11 a gallon) but I ain't giving them $100 to change it for us.