If your thinking of building a TPI intake based engine,your almost racing a horse wearing hobbles here!
the stock heads flow about 200 cfm , they are very restrictive, it makes very little sense to use an intake that once ported can flow more than 275cfm matched to heads that flow 200-220 cfm, or restrict an engine with a cam that won,t allow air flow much past 5500rpm, matched to an intake that flows well past 6500rpm.
your wasting your time with the stock cams designed to meet the TPI flow characteristics and peaks at about 5500rpm,,
the stealth rams designed to flow a good deal more air at a much higher rpm than a TPI, a stock or even mildly ported TPI basically post stalls by 5500rpm,the stealth ram can easily allow 6500rpm or more with the correct cam and heads, gearing etc.
youll want a 3.73:1 rear gear, a 3000 stall converter or manual trans

a properly ported stealth ram, matched to decent heads
http://www.profilerperformance.com/r.../sbc-23-degree
heads that can actually use the potential intake flow rates, 30lb-40 lb injectors to supply the required fuel to match the air flow..

and it would sure help if you build a 383 -406 SBC to use the extra air flow potential,with 10.5:1 COMPRESSION OR AT LEAST SELECT HEADS FOR YOUR 350 THAT FLOW AT LEAST 250 CFM AT .500 LIFT AND GET TO 10:1 COMPRESSION MINIMUM
obviously what goes in needs to exit so a decent set of headers and a low restriction exhaust is mandatory


http://forum.grumpysperformance.com/...numbers#p18935

http://forum.grumpysperformance.com/...numbers#p17237

http://forum.grumpysperformance.com/...numbers#p16619