Timing marks on Pug 306???

Whilst attempting to change the timing belt on my pug 306 I located and inserted the locking bolts on the Cam pulley and the Injector pulley. Not realising that the Fly wheel must be locked off aswell, I tried to undo the Crank pulley. There was movement on the crank pully but not anywhere else. Realising my mistake I took out the locking bolts to locate and lock off the fly wheel. Now the engine will not fully rotate-on the crank pulley nut, so i am not sure if one of or both of the Cam/Injector pulley has moved, thus throwing the timing out all togeather. How do I find the right positions so I can realign it all to change the timing belt