You dont need to worry about doing anything else to the engine if your just going a bit higher spec than the standard cam.And you dont need a big cam on a daily driven car anyway. It will just make it a dog to drive.Just make sure you get new lifters as well as the cam or the old lifters will chop out the new cam lobes in no time.Both the lifters and the cam lobes wear in to match eachother basically.I know a couple of blokes who have bigger spec cams fitted to V6's and they run really well.One of them Ive been in a few times now,and it goes excellent compared to when it was standard,he's only got extractors and exhaust fitted besiders the cam.Ive seen it beat a few standard V8,s off the line.It goes good for a N/A six.Lots of low down punch.