The springs are too soft in rate and probably the wrong height.
The later spring is also a larger diameter.
early was 5" OD, second gen was 5.5" OD.
The best drop-in stock height spring is a Moog first gen Z/28 spring #6308, it's around 390 lbs rate, stock was around 327 lbs.
A 550 would be ideal for good street handling, 600 to 700 for wide tires and agressive driving/track or autocross.
You could also buy a plastic spring seat spacer that would raise the car back up. It would need to be approx half the thickness of the needed height change due to leverage over the spring.
So, for a 2" height change, a 1" spacer would be needed. This is just a guess.
I'd really recomend a stiffer spring than stock if at all possible. Also good shocks and swaybar.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Chev 350
Can Am Vintage Racer
[This message has been edited by davidpozzi (edited 05-05-2001).]