Re: Timing marks 350 engine
Depending on the year of the engine, and the water pump design, timing scales were moved. Later engines had the long water pump, and had a bit of clearance between the timing cover and back of water pump. For these engines, the timing scale was on the timing cover, above the dampener, at the noon position, visible by looking down between the back of the water pump and timing cover. Those engines were done that way to allow for the extra bracketry added for accessories, belt drives, and most obscure the side mounted timing scales, so timing could be read from the top of the engine, not from the side.
A short water pump setup won't have the open area between the back of the water pump, and timing cover. They all read from the side of the engine.