Thanks marko57 and porkface!

I took the Bosch 4301 plugs back after reading the (huge) thread on plug types. Since the Bosch 4301, 4501, and 4418 are all "newer" type plugs, I stayed away from all of them. The F8DPER and F8DPP33 have been replaced with the Bosch 7422, but I couldn't find any of those local. So I went with the NGK 7090's. So far, so good.

Thanks again.