Okay, so I was too hung over most of the weekend to work on the car. But I finally did clean up all the parts and get them all out of the trunk. Now, I'm looking at the two heads I have (I got one off e-bay) and they both don't have the same numbers stampted on them. Now, I knew that the engine had been rebuilt, but I didn't realize they used a different year engine. Not sure if it was a total swap, or just a basic top rebuild.

Anyway, the head that was in the car has the following numbers:
three circles with 03 07 89 (I'm guessing this means date of manufacture of 3 July 89) and 7 with 393 right under it and 1326777 is stamped just above the thermostat.

The head I got off e-bay has there numbers:
three circles with 15 4 87 (Again, probably 15 April 87 DOM. y/n?) and a dollar sign with 6770 under and 07074 under that and 1326777 is stamped just above the thermostat.

The cams appear the same, but I haven't bothered measuring them to be certain. They both have 1000132 stamped on them, so I'm guessing this is the part number. And this would imply that they are the same. But one has LYD7 and 29 D 7 stamped on it, and the other has LYD14 and 26 K 9 stamped on it.
Now, am I being overly cautious (I think I am), and there is no problem with just slapping the newly acquired head on, or should I swap the cams? If so, what do those other numbers and letters represent? More DOM and plant info?
Good news is the stuff is all cleaned up and ready to go back together. Just have to pick up the new head bolts, and slap everything on.
--
Turbo Brick owner in training.