Originally Posted by sixto

Put the sprocket back on the cam and set the engine to #1 TDC before you proceed. The cam tower removal and installation sequence is only valid with the cam at TDC. It wouldn't matter if you were simply lifting the head to replace the gasket, but anything can happen requiring the cam to come off so it's worthwhile insurance. If the cam is off the original position when you set the head on the block, you'll likely bend valves.

Sixto
87 300D