Any explanation would help if its not too much of a hassle. I'm not a mechanical genius but i know the basics. Anyways the background for this question is I have a two complete engines a '74 with a cracked block because the PO didn't bother with antifreeze but otherwise solid engine and a '70 with stuck valves from sitting around for 10 years. Rather then doing it the right way and dealing with the valves I was hoping to "frankenstein" a useable engine.
It is my understanding that the F blocks used a bypass filtering system lending the top end to minimal oiling. The 74 block went to full filtration system which provided improved oiling throughout the engine. with a different feed to the head. Is the crack in the 74 block external or do you have a mixing of oil and water?