360 timing cover, which bolts go into water?

Yeah what He ^^ said.
The 4 long bolts may ALL be different lengths and each one has to go in it's specific location, based on how many brackets it has to go thru. The Driver-side front cylinder is very close to the outer edge of the block, and closest at the top, so you gotta be real careful at that location. NONE of the bolts should engage the the block-threads by more than about 3/8 inch.