V8 with no power

Hi, I finally have my D2 V8 back together, and it is running.. but not well
It idles nicely, and seems to have reasonable low down power in that I can move it about with very little throttle, however it has almost zero performance when driving and seems very reluctant to go much beyond 2.5K (revs fine in neutral). One thing that did happen was I initially had bank 2 connected upside down on the coil, this resulted in some interesting noises. Would this have resulted in any significant issues? Is my MAF dead or have the cats died, or have I possibly got the cam a tooth out? (the chain was a bit slack when I put the pulleys on)

go on too the engine section for v8's the lads on there will have the answer good luck

I may have found it, it appears there is a lambda circuit failure on bank 1