I've been assured by Milledge that an early car could get down even 75 lbs lighter.

Rear spring rates are not a problem if you know where to look. I have 32mm (effective) hollow t-bars and can get up to 34 or 36 (can't remember which). That will be more than enough.

The intake is not so much the problem on the 8v 944 as the cam. No overlap. It's quite limiting.

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My car was a 85.5 so I dont know about the 83 and 84's but we could not get close.... We played with a couple different intakes a found a fair bit of restriction there but I agree that the cam is crap too and even with altered timing we got alot of pulse in the afm