W2 problems

Ok guys I'm new here, but im not new to mopars. However w2's are new territory. The problem I'm having is I have a mopar performance stroker short block p5007840 it's the 406ci. W2 heads P5007089, rocker shafts P4120589, rocker stands P5249049, rocker arms P4876343 and camshaft P5007696. I had to do the cut to fit pushrods, I put it all together and I can't even turn the motor a quarter turn, the pushrods are hitting the intake side of the heads. I called mopar performance and they thought I was using too thick of a pushrods, but I am using the 5/16 pushrods.

Where am I going wrong?