So my 92 eclipse wont start at all. it cranks and cranks. it also backfires though the intake of it. when i git it timming belt b was broke off. so we timed it again and still wont start

Check compression on all cylinders. If timing belt broke it probably bent some valves. Got to love those Interference engines.

you jumped timing bud and its a bitch to fix on dohc best bet is take it to a shop before you cause any more problems inside the motor

So if it has no compression on any of the cylinders. I have to do the head of it. Don't I. I also found out the car wad in a wreck and they put a 93 turbo block in it with a stock 2.0 head on it will that make any differents in it

if its a n/a head on a turbo block that could be cam specs are diff

Just done my heads. Not all that hard just use caution when putting belt back on. If cams not timed correctly you will bend the valves again. I would replace all valves, lifters, valve seals and water pump while you got it apart. If you order valves on eBay you will save about fifteen dollars a piece. good luck.