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when you assemble these engines, the cams should be installed at tdc for that bank......so when you installed bank 1 cams engine should be at cylinder 1 tdc, when you install bank 2 cams engine must be at cylinder 4 tdc....meaning you spin the crank 1 rotation to get cyl4 at tdc.......
I have built many of these engines....and would call myself an expert....pm me for my cell as in not on the forums a lot....and texting is easy along with pics you would need to send.
to me it sounds like bank 2 cam timing is way off or b2 is 180 degrees out.....