Odd timing problem 360

Thanks for the responses.

For the record I have and Edlebrock roller timing chain and the 3.9 chain tensioner in place. I pulled the distributor/oil pump gear out and replaced it with one I had out of a 67k 360 motor. Did not have time last night to warm it up and test. But at first glance it seemed better.

Just more FYI. We use the same timing light on my brother's Duster which is the same as my engine except for the cam and pistons. My Sears light works just fine on his.

Someone mentioned changing the busing the oil pump gear shaft rides in. Can I do that without pulling the intake?

I am going to try testing the timing chain tonight and see about the rotor moving too much.

Thanks again,
Dan...