Freelander 1, 1.8 petrol k series possible timing issue

HI you lovely people, I was wondering if anyone could help me sort out my freelander 1 1.8 k series before i phone the local scrappy to come take the thing away.
Basically the timing bety tensioner came off and the belt slipped damaging 7 values. I stripped it down and replaced the damaged valves, replaced the head gasket and put it all back together.

Lined the crank shaft timing mark, lined up the cam shaft timing marks (can't get it any closer than 1/2 tooth apart)

Car won't start, it turns over and there it makes a splutter noise (a very quick one) and some times there is a bang (possibly backfire) sound coming from the air intake.......

What have I done wrong? please help............

It's possible you have timed it on the exhaust stroke rather than power stroke, remember crank rotates twice for one rotation of camshaft, also it's possible to put cam gears on camshaft wrong, the pin on camshaft fits in the groove nearest to its corresponding word on cam wheel , ie exhaust or inlet

double checked the pins when I put them back together so I don't think that it, i will triple check tomorrow, any other ideas if thats not it?

I've just triple checked and the pins are lined up correctly. inlet pin, in the in side and exhaust pin in the ex side