Because of my lack of planning I attempted to re-use my old timing chain and gears from my destroyed 302. I lined up everything and installed the chain and the gears. When I turned the engine over by hand, I noticed the chain would go from very tight, to very loose, on both sides... My old cam was reground at delta cam, so if that was messed up they would have told me. The 306 block I am working on is new, so the only explanation is that the gear is warped.. No idea how that could happen... I am going to order a new timing chain set.. It just sucks this happens on a Friday when I had all weekend to work on the engine..