Quote:

Would like to know which advance springs to use.

I'd suggest (1) setting the initial with the "vacuum gauge method" then (2) with that figure in hand shorten the slots to get 36 total then (3) plug in vac adv & pick a spring combo that keeps you just under the pinging point at WOT up thru the gears on your hottest/driest day then (4) adj vac adv (2 adjustments). Seperate issue- you want the spring/slot adv to start several hundred RPM above the in gear idle speed (or neutral if stick). Keep vac adv capped off for (1) unless going with manifold vacuum & capped off for (2) whether ported or manifold vacuum. A short stroke 383/400 MAY work well with significantly more than 36 total. You can always change your settings. #1 if you can afford it dont scrimp on the octane.

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