I'm new to this board, so excuse me if this is a basic question.

I'm just purchasing my first early 911, a 73'S with matching 2.4L S engine. Its stock, but needs a rebuild.

There are two modifications I've heard a lot about that seems to improve the driveability and maintence of these engines.

1- 'Modified S cams' - guess these are new CAD designed CAMs that improve the power band. Anyone had experience withthese and can you recommend where to get them from?

2 - Twin Plug - I'm told you re-machine the original heads with a second hole for the second plug vs new heads? What about alternators?

Any general comments, opinions, referrals, etc.. are welcome. Also, anyone know how much this adds in power?

Thanks,

Chris