From what I've heard, you should pick up quite a bit from that cam and your exhaust changes. I don't think the throttle body will do much if anything for you, and you'd be much better off spending the money on something else, like a nice ignition box or something. Or maybe shave your head to gain compression, and do a little port work while you are in there.

Hey, I notice that you are from Newbury. Would you like to be emailed if we have some kind of get-togethers in the New England area? Jason (shovelfxr) is also from the region.

Greg
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http://home.earthlink.net/~greg.wong/

Adam, shovelfxr is correct. You need to modify the head first to utilize the extra flow or get a turbo motor. I modded a Datsun head about six years ago and am just now adding a larger tb port matched to the intake. The head mods will give you more bang for the buck outright. The tb helps with additional flow for better throttle response. Save the money for the head work - you've already got the cam and header coming so your half way there for a decent na motor.
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92 244 lowered, Bilsteins, IPD sways, Unitek cam/header, TSW Revo 18x8's - 94 965 Niiice MONEY PIT! - 76 Datsun 280Z lowered, modified head, cam, headers, intake

i'm guessing, but i imagine without serious head mods, the TB is unnecessary