Engine Problem

[shadowgray396]

Been working on the Chevelle the last few nights and the engine will only turn about 270 degress and it seems to kit something like a bolt sticking out some where. We have check everything we can think of and still can't find the problem. It turned over ok on the engine stand, but since putting the starter, fuel pump, distrubutor and trans on something has happened. Hoping we are not going to have to pull the engine back out. My friend (mechanic) thinks something may have fallen inside of the engine, but I kept everything covered up so that would not happen. we have done all this by hand and not with the starter to avoid any damage to the engine. Any idea's????

Ray