Magna-fluxing found a Crack in one of the heads

I don't think I've ever seen a 360 port size with a 1.78 valve. The 318 4bbls got the 360 top end with the 1.88 intake valves. I think the mentioning of a 1.78 intake valve might be a misprint because all other castings with the 318 port size had 1.78s.