Weren't 3/4 cams the old GM/Chevy 'racer' cams from like back in the 60's? There was a post about 3/4 cams a while back...you may want to try a search and see if you can find it.
Just an idea.
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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