Mq/280z l28 distributor problems

[Mq..patrol]

I have recently put a new head gasket on my l28 and after I put it back together it won't start I thought it was the timing chain out a bit but I took the timing cover back off and that all lines up. All I can think of is the distributor because the distributor and the oil pump sharft can both move separately when there out of the engine and I am not sure how to get the distributor back to firing on the 1st cylinder at the right time. Any help will be much obliged 

[Zed Head]