There was a Sunfire red '64 coupe running around town here awhile back, and it looked really sharp. Sort of a coppery metallic but leaning to salmon or coral hues. Not even close to pink. It looked waaay sharper than grenadier red, IMO. I say go for it and keep it original. Sunfire Red is the "Iris Mist" for '64....a rare and unique color.
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Jeff 
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