Timing Chain Cover

glockr said
The timing marks on the cover will be 90 degrees off from the early timing cover, so you'll need to put tape on the harmonic balancer with marks in the right location. If you're running the original radiator and water pump, the marks will be hard to see because the lower radiator outlet from the water pump kind of blocks the view. It will physically bolt up and work though.

Thank you for the info. My original is so far corroded and pitted that when we pressure tested the engine we had air leaks out the valve covers. Since we have capped off the different water jacket routes and discovered the block is fine and it was probably the timing cover. So I appreciate the info.