1998 Chevy Lumina Need some ideas on what to look for?

I replaced the intake manifold gaskets on this car. I made damn (3-times making sure) that the pushrods went back in the same spot. I put it all back together and when I tried to start it, it had no compression. I immediately tore it back down to the pushrods. I took each pushrod and measured them individually. The exhaust rods were 6 inch and the intake were around 5 3/4. They were installed correctly. I put it back together and still no compression? I did a compression check on each cylinder. (1=65) (2=90) (3=90) (4=120) (5=150) (6=60). I know each cylinder should be over 100psi. Any ideas of why I would have no compression when the pushrods were installed correctly? I should not have any bent valves? I also torqued the rocker arms to 124 in lbs with an additional 30 degrees. I have also read it should be 89 in lbs with an additional 30 degrees. With 124 are my valves too tight?