Hal has a coil-over set up for the first gen. It uses their promo-star 12 way adj. shock[which is re-valvable+re-buildable]with a progressive spring.The small end of the spring rests on the SINGLE adj. collar the larger end is the same diameter as a normal spring and goes up into spring bucket just as a normal spring.It has a mounting"pearch" which is just a flat piece that bolts to the shock mounting holes in the lower control arm that has two ears with a bolt hole through them for connecting the sperical lower shock mount.the top just like a normal shock.Height adj. could be made by turning the one adj. collar,its supposedly 12 way adjustable,re-valvable,re-buildable and spring changes[if ness,not sure what the spring rate is]could be done by supporting the car with suspension hanging free, back the adj. collar off to release tension on spring, and then remove it like you would a normal shock.OR possibly after releasing tension you could remove the "pearch" and pull it through the hole in the control arm[I havent tried any of this yet,Im just kinda thinking out loud]

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68 candy brandywine 383dfi/T-56 87 monte carlo ss aerocoupe

Thanks for posting the info.
Got any links to a Hal website?

Say, please hit the return key once in a while, it will make reading your posts much easier.
Thanks, David

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Check my web page for First Gen Camaro suspension info:
David's Motorsports page (http://ourworld.compuserve.com/homepages/David_Pozzi/)
First Gen Suspension Page (http://ourworld.compuserve.com/homepages/David_Pozzi/first_gen_suspension.htm)
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer

Check this link out for Hal shocks.
The Hal site is not up yet. http://www.martelbros.com/hal-shocks/10.htm

sorry,im pretty much a cyber-rookie,I guess Ive got a yellow stripe on my mini-tower!

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68 candy brandywine 383dfi/T-56 87 monte carlo ss aerocoupe