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Re: Block Casting Numbers
my reference says 68-79 with 200-255hp, 2 or 4 bolt main.
http://www.thedirtforum.com/castings.htm#block
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90 Camaro RS V6 - swapped to V8
-350 block, GM Vortec L31 Heads, Edelbrock Performer RPM Vortec intake, 750cfm carb, CompCams XE268 Camshaft
ESTIMATED 360-420 hp 380-430lb/ft torque 
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