lol my engine is similar with leaking oil, instead of replacing the N/A parts, i decided to just do the m90 swap now. As far as rockers it really depends, if u go with the 1.9's your going to need Lsx style springs and retainers, I personally went with Yella Terra 1.9 roller rockers with L76 springs. Rockers are rockers the modded ones from zzp are stock style ones, while the yella terras are roller's from australia

. Anything less like 1.7's or 1.8's you can use stock springs.