motor wont turn over?

yes, engine ran great, I pulled it out of a coronet I have and put it in my 69 cuda. the motor was fresh. I built it about 3 years ago. it did sit for a while sealed up though. i pulled the heads ad timing cover just to inspect it while the motor was out, i did pull the timing chain off intending to replace it with a double roller. Well, money got tight so I jut put the new/stock chain and gears back in, only thing i can think is that I must not have lined the dots up on the cam gear and crank perfectly. any way, I'm going to tear it back down in a couple days whe its not so hot here in the shop. I was just trying to see is tht sounded like a possibility to any of you guys