The "Roots-Type" Holley takes the place of the intake and draws through the carb instead of ulilizing that funky "bonnet" you need with the centrifugal blower.

You might try joining some of the mailing lists, or asking the "racing" forum about tuning info.

Personally, I'd just go to a stroker 351W, and forget the tuning hassles. 408ci will make you forget about the blower.

If you're set on a blower, get the Holley... a specially tuned "blower" carb will be required as well. You can modify a regular carb yourself, or purchase one modified from a carb tuner/builder. You might possibly need a cowl-induction hood. 2.5" would be plenty.

Good Luck!

With the roots blower, you don't have to wait for boost. The centrifugal blowers don't start making boost until around 3-4k rpm in most cases. The Holley's "snout" pulley is offset up and to the side for distributer clearance, and so the unit can sit lower. There's a link to it at the Holley site.

http://www.holley.com/HiOctn/ProdLine/Products/AMS/SC/SCK/77-174_FSBP.html

Good Luck!

With this, you simply turn the dial, and it automaticall retards the timing "X" degrees per pound of boost. If you set it for "1", it retards the timing one degree for each pound of boost. So as the boost climbs, the timing gets retarded more and more... keeping the engine out of detonation.

I consider one of these MANDATORY on any blower application. The EFI guys have custom chips burnt to do this. I believe MSD also has an add-on to work with their MSD Digital 6+.

I'd go ahead and spend around $170 on an MSD billet distributer at the same time. These come with a big cap, but can be replaced easily with a smaller one if space is at a premium.

This might seem like a big job... and it is, but it helps to be informed so it gets done right... the FIRST time.

Good Luck!