Spark-Plugs: just standard NGK's are good. No need for Platinum (irridum) plugs.
Air/Oil filter: I use Ryco filters, not sure if you can get them over there tho, coz they aussie made.
Oil: I would reccomend a semi-synthetic for an engine that old, possibly Penrite Pedigree 10w-30, if you got any sort of problem with valve stem seal leaks.
Spark plug cables dont make too much of a difference, the larger ones do give you a little less resistance, but other than that, there is really no point getting bigger ones.
Air/Oil filter: I use Ryco filters, not sure if you can get them over there tho, coz they aussie made.
Oil: I would reccomend a semi-synthetic for an engine that old, possibly Penrite Pedigree 10w-30, if you got any sort of problem with valve stem seal leaks.
Spark plug cables dont make too much of a difference, the larger ones do give you a little less resistance, but other than that, there is really no point getting bigger ones.