as long as it doesn't smoke it'll be fine
i've bought the whole kit off of ebay gasket wise and it was only ££70 (this is for the 2.3)
when i did my twinky (it's the same bits you need) i did the oil pump and tensioner and chain as well as all the guides and that lot came to less than £120

make sure you put thread locking stuff on the bolts that hold the chain guide arms in place, they tend to work themselves loose and make a mess if you don't

the new chains come with little marks on them to make sure even a doofus can't time them up inccorectly
just make sure that if you need to take the woodruft key out you turn the engine over with the head off (you'll also need a puller to get the crank pulley off)

one more thing, don't forget that there are 3 little bolts hiding inside the chain hole in the head, these are sometimes covered with oil and you don't spot them

any other questions just let me know, it really is a peice of cake on these

one mroe thing, they use a 3 layer gasket and the antifreeze/coolant mix should be 40% coolant-60% water