that cam you showed will require new valvesprings according to their page, but then again so will most cams. Im not so sure on your engine, but on most engines, throttle bodies are a waste of money unless you port your intake manifold. And even then youre gonna need some serious power to take full advantage of that. Go for the rockers, they will definately help, and i dont understand why someone would say they make no sense on a aftermarket cam. Thats when they shine the most. :smileup:
You should really try to read up on how a camshaft works. The LSA (lobe seperation angle), is the distance from the very top of the intake lobe, to the very top of the exhaust lobe. The less lsa you have, the tighter the lobes are to each other and this will create overlap. This is when the intak and exhaust valve are opened at the same time causing the choppy idle sound cammed cars usually have. Generally, the more overlap you have, the more top end torque youre gonna see. Therefore, lower LSA=high rpm cam.
Cam timing is set by how the cam sits in position to the crank. The +2 or +4 is just what that means. The advance that has been grounded into the cam so it will not affect the lsa, even though they are somewhat related.
So lets say you have a cam with an lsa of 112* +2*
The lobe seperation angle is still 112*, but the ICL (intake center line) had been grounded for 110* and the ECL (exhaust center line) will be at 114*.
Its kinda dificult to explain without pictures but i hope this helps a bit. Remember, there are always exceptions and such to what i posted.
If you can get a hold of someone who makes custom cams, give em a call. They will give you tons more info and will definately know theyre stuff. Some people from "off the shelf" cam companies might only be telling you stuff in order to sell.
Hopefully this helps