Cheers for the help buddy, i think the best bet is to buy the whole topend gasket kit from toyota (with H/g and valve steam seals) and rebuild a spare head i have then swap it over.
I was thinking am i beter disconecting the Lambda sensor as i think its causing the other 3 cylinders to run lean, or should it be ok?
Cams and valve caps from my head, could be swaped to the new head in the correct order is that right? and wouldnt need shimming etc.
You can get away with using caps from another head, but you'll need to check the oil clearances with some plastigage. Standard clearances should be between 0.035mm - 0.072mm, if any are more than 0.1mm then it's definitely a no go for those caps.
a bit of a diy port to the head would be good too while its out
Head set 04112-11091
Timing belt 13568-19106
Idler pulley 13503-11030
Tensioner pulley 13505-11040
Tensioner spring 90506-16050
It would probably be cheaper to invest in a timing belt kit from one of our traders though.