MS3 cam
You will need Double valve springs for sure for an ms3. YES, it is entirely necessary to change the timing chain and the oil pump is a must ESPICIALLY with higher miles. Will your car function with the stock pump & chain ....yes. The timing chain and new oil pump are very cheap insurance. Just think when your chain breaks or your pump suddenly dies you will probably be in need of a new motor.
IMO, MS3 requires plenty supporting mods to work well in a 346cid. There is simply no need for such big stick. (in daily operations).
If you want your car to lope, huge durations are not necessary, overlap is. Smaller lobes, tight LSA will bring the powerband into useable range and give the desired shake and bake effect.
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