Bob
As you are probably aware by now, Michael Andretti drove all ground effect Ralts delivered to North America whether FSV or Atlantic...
This is described in Ralt records as an 83 car delivered 19 March 83 to Penske. Michael Andretti only drove Long Beach SV in 83 [IIRC] spending rest of year in Atlantic. His Long Beach car was probably 390, sold after the race to Hank Chapman, and then on to Ben Gustafsson/Graham Scott.
Happy new year
Chris
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