Don't bother with solid lifters... You're not going big cam and you shouldnt be revving the shit out of it. If you really want that peak 300kw, then go the bigger GTX30 when IMO the latest GTX28 will be enough (or if it doesn't make 300, will be a much better suited turbo). +1 to cos worth headgasket +1 to BC automotive springs In regards to valve train... I think usually RWD guys go for springs (sometimes retainers), Rocker arm stoppers (but is often contested by people saying it causes issues), cam gears + cams, removal of squish pads (I think) and some go valve stem seals (not sure why, get machine shop to check the head over). I don't know why you're replacing rockers unless they're worn. Don't bother with Tomei/Jun/Naprec valve train stuff, seriously expensive and shouldn't be required for a mild build. Also: consider what other mods the mazworx motor had when doing the plenum results. I think PITA stuff under the plenum is unavoidable unless you're stripping the engine bay and redoing everything.