** POP ** (can of worms opens)
IMHO - there's nothing wrong with Castrol GTX oil , it's made for high-revving motors . Good quality stuff , I've used it for years in ALL of my cars (LOADS of cars BTW

) . All of the cars that go through our restoration shop get that oil too . I wouldn't be afraid to use it all the time (that's why I do

) .
As for the NGK plugs - did you try a local auto parts store ?? Most of my local stores carry them . How 'bout any local import auto stores . Just an idea ...