I agree with Scotty whats wrong with the stock cams ,there are a lot of mods that can be done to a RB25 before you have to change cams unless you have very deep pockets, Cams , good springs , retainers maybe head machining ,port work ,injectors ECU where do you stop and also a lot of patience driving around a car that you struggle to drive. I am not saying not to modify it as most of us do but do what you can without cam changes, what gearbox are you running , what sort of daytime driving , is it a regular track/daily driver.I have been building and racing cars for the last 40 years and some have been an absolute bastard to drive to work in heavy traffic , on the open road absolute magic , around town a pain in the arse