What should I do with my 340 that has been sitting for years.

This 340 is out of my Fathers 1970 Duster 340 4spd. It was pulled in 1990 and had sat ever since in Texas and now at my place in Northern Virginia. My Father decided not to disassemble it and I left it that way in storage for years. It had been oiled at times and turned over maybe 3-4 times. What is the best thing I could do for it now? Oil it and clean up the surface rust that has formed? Disassemble it? I am not sure when I will ever rebuild it. The car has a Mild 360 I had built for it in 91 in it now.

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