I did some research in my color chip books and found some colors that are close.
Toyota colors from 1982 have some really close colors to O.Gs Multi Mav and other cars of O.Gs. I would look at these and tint or add pearl to one of theses colors to get what you are looking for.
Toyota has a color that is called Ice Blue, paint code number 8G2
Small quanities of this color can be purchase at TCP global and Automotive Touch up Finishes
A great product for adding more pearl to which ever color that suits your eye are pearls made by the Jacard company. Hobby Lobby has a good selection of these pearls.
I could give you my formulas for what I would try however they would need to be tweaked to get the effect you want which can be a long process. That's what really prompted me to look at color chips to get you close vs a formula.
I hope this helps... if I can help any further... Give me a shout.