Anti freeze question

[ccsd34]

I am replacing the thermostat in my 383  1968 charger.  While im replacing this, I am planning on doing a radiator flush and plan on putting new anti freeze in it.  I drove this car everyday in high school (graduated in 2000) and the car has been driven very little since then.  The anti freeze in the car now is the same as what was in it when I was driving it everyday and is the old conventional green antifreeze.  Was planning on replacing it with the yellow prestone type.  Is that OK or should I go back with the conventional green?

[c00nhunterjoe]

A 50/50 mix of green is plenty good enough.