Considering going bt this summer,bnrs3 to be specific. Went with this instead of gtx because i want around 350whp and beaner is cheaper than the gtx.

However i wanna prepare my car first
It has 150k km so i wanna do some maintenance first. Imma star with cleaning the valves and IM. Now that ill be taking it off i was thinking on replacing the injector seals n studs(cpe ), tb gasket and coolant bypass(jbr) intage gasket(jbr) occ, egr delete. Spark plugs. Any other thing i should upgrade or take a look at while im at it?

I dont feel confident doing this work myself tbh. Ill be taking it to jimmy probably, any approximate for this kind of labour?