The only way to tell if its a gennie 1969 A body block will be the VIN stamped on the block...should be "LS2_H9XXXXXX"...." for a Dart, and "BH2_H9XXXXX for a Barracuda, I believe. "H" is engine code for 383 in an A-Body.
That's pretty much the answer I was looking for. I don't understand why, when you run the cast number 2468130 it states B block and no mention of it being in an A body. Oh well not that important! Thanks Guys!