Do a
stock rebuild, cast pistons are fine.
Use the 068 cam as suggested above (and by myself on the HAMB, draggin'GTO). The valvetrain on these early stud-oiled 389s can't handle big cams unless you do a lot of mod$$$. Keep things cheap, simple and reliable and use the Pontiac 068 cam along with all the stock valvetrain parts (use some new stock springs).
Put in a good M54D Mellings 60# oil pump along with a new Mellings pump driveshaft. No windage tray needed, these engines didn't come with them and adding one won't buy you anything but added expense. Have the stock distributor recurved for performance by a reputable shop, that's all you need.
If you don't deviate far from stock you'll be rewarded with many trouble-free miles from your '60 389. This engine will make excellent power from idle to 5000 RPM, you'll be able to smoke the hides on your sedan pretty much at will and you can drive the crap out of it.
