Any ke70 owner ???

okay lets see rite now im using a mirage wit 4g61t..jus say dat ive been keepin up sum money n i wan to mody..if u were me wat would u do??upgrade the 4g61t or would u jus swap engine wit 4g63t..i heard lots of people say ma engine bay is exactly a bit same wit vr4 n they say if i use vr4-rs it should b enough(the hp n weight to ratio)..but in the other tought i was thinking of upgrading the 4g61t(turbine,injector,pistons,flywheel,cams,ecu n those other stuff) but wat i dun no is if i...