All these hot Pro Touring cars are cool, but I want to approach it from another direction.

It's cool that folks can build 3500 lb. street touring cars with 7-800 horsepower, but I've got ideas for a smaller, lighter, cheaper approach -- 500-550 hp and about 2200 lbs.

That means lighter everything. Like saving 30-40 lbs with a G-Force T5 instead of a Richmond 6 speed. Saving like 100-125 with a carbureted aluminum LS instead of an iron turbo/supercharged/nitroused one. And maybe saving 75-100 lbs with a GM 10-bolt 7.5-inch instead of a 12-bolt or Ford 9-inch rearend.

What would it take to build a 7.5-inch 10-bolt to take a weekend of 3000-3500 rpm launches with 4.11 gears and a manual transmission without scattering parts all over the track? Is there a better lightweight option than the small 10-bolt rear axle?
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That sounds like a fun plan!
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Randy you will enjoy a build like you described a ton and will even be able to afford to drive it with much better mpg. I have a 72 Datsun 240Z with a 385 hp 350 and T5. Averaged almost 22 mpg on my last cruise across country (4931 miles). Happy with everything but the brakes which were upgraded with best kit available, just not enough with a car that will cruise at 150. Built car to tech for 160 mpg class in open road timed events. 80% done with install of full frame and 1996 corvette grand sport suspension which is lighter than the Datsun suspension. 
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The Exorcist
Randy, a Ford 8.8 rearend might be a better choice, there are tons of aftermarket parts for them.
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and 8.8 are cheaper in salvage yards too
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