timing issues with twin cam 3 litres are a pain in the ass. keep trying. it took me months and months to fix my engine over a year ago...
I ended up doing the timing many times and found the engine made the best power with the cam gears set to 0, you can try to put 2 x cam gears on and setting everything to 0 and test to start this. after this then try and move them around for more power. First try and get it in stock position.
To give you an idea, i gained a extra 50 - 60kw at the wheels after fixing this cam timing issue, was a major head f**k but i was very happy when i finally managed to fix it.
From memory mine was allways out on both the inlet and exhaust side. it was only very minimal and did not look like it was far off but it did make a major difference in power!