Thread: Need Help! Engine wont turn over.

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Ok guys I am at my ends whit with this thing and hoping one of you can help me out. I have a 1979 Z-28 with modified 350 in it. It had an old clutch fan on it and apparently decided to wear out on my while driving on the interstate. The car overheated and i had to get a tow. The fan was wore out so i took it off and put a new Straight fan on it, hoping that this would solve my overheating problems. When I went to try and crank her back up it sounded like the timing was way too high. So I turned the Distributor back a bit hoping that this would solve my timing problems and crank her up. Unfortunately this was just the beginning of my problems. I turned the key and instead of turning over it did nothing. So i turned the distributor back to the original position. Still nothing but an electrical sound like the starter was just hanging up. I then tried to turn the motor manually and found that i could turn it all the way to a certain spot and then no further. Then turn it the opposite way to the same point but no further. Believing to have a stuck valve i pulled the heads and inspected the valves, all seem to be in working order so i tried to turn the motor over again. Same problem, stuck in the same position. First off I'd like to thank you for being so nice to bear through this huge explanation but i wanted to explain it the best way a shadetree mechanic could. Next id like to know if the trouble is with my cam. It has a solid cam in it but i do not know the specs on it (came with the car). I hope this problem can be fixed because i believe this motor is just too good to toss aside. The guy i bought it from was trying to build a drag car and spent a fortune on after market parts. And the motor ran really well up to the point of over heating due to the fan problem. Thanks again in adance for any and all help.