If it's anything like the fuel rails on the early 5.0s you'll need a special tool that releases an inner clip, then it slides out with very little resistance. You should be able to find the tool at napa, maybe even autozone or advance.
8psi=black smoke. Usually with N.O.S.'s jetting guidelines 4.5psi is optimal on a low pressure system. I've got an extra regulator if you want to run one for the plate and one for the carb.
As for 120gph that should be enough for a 150 shot, maybe more if you've got the clankers
Timing - 2 degrees for every 50hp of spray, but a little more will probally help a car as massive as your Buick. I'd go -8 degrees with a 150 shot
From my experiance with nitrous I can tell you the double sided tape doesn't have a chance. Can you drill into the underside hood bracing? If so you could use small nylon loop clamps.
As for the flexible section of line required -03 stainless braided nylon line used for brake lines would be ideal, it's availible in different lengths. Just cut what you need(a shard chiesel and block of wood work perfect) add the approriate fittings(not cheap) and thread into solinoid.
Purging out of the nose would look very evil, just be sure it doesn't come near the air intake.
I'm the man that killed jesse james, i've got 100% argon, 75/25 argon, mig, tig, and cobra outfits. PM me for quotes, I'm arrogant but reasonable smile.gif
Drilling bolts can be a bitch. If you have access to a drill press your no problem otherwise good luck. It's usually best to treat bolts like stainless steel, use a low speed 500rpm or so and lots of pressure hence the drill press. Lots of lubrication helps.
If you don't mind the gear whine you can pick up a used jerico for about $2500. I just got a road race box w/ alot of options from muscle motor sports in NC. It's pretty much bullit proof but isn't designed for power shifts like their drag race box.
there is no 50k service but at 45k it gets coolant change and air filter and at 60k it gets spark plus, air filter, oil change, and tranny service plus inspectons