motor wont turn over?

You should take out your pushrods and try it without the top end involved. You may be getting coil bind on the springs or exceeding the operating range of the lifters. If you think it's the timiing that is easy to check. Just line up the balancer to TDC and check the piston placement in the hole. If the piston is still moving up or going back down at TDC then your timing is off. If his plugs were hitting the pistons I would think the elctrodes would be mashed down and loosing their gap everytime the piston rotated. If you really think it's the timing then you should be pulling off the front cover. I know it sucks to dig back in but, It doesn't sound like a tweak is goin to fix it. Good luck finding the issue