car will turn over but wont start

have u checked the starter, i:e done a voltage test , checked the operation of the solenoid. it will also help to check the battery, do a voltage test , voltage loss test, check the condition of the battery - visually. have u timed it correctly? u obviously know what your doing but it could be something real simple, like a faulty fuel pump or an engine fuse, i would got through both fuse panels and check every one. when rebuilding ur motor did u go off a manual ?

i have checked all the fuses allready and the car turns over fine, and it is fireing and getting gas, and its in time, but it turns over very fast

Have you checked compression on all cylinders.