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I'd put my money on the Chevy. And I am a Ford guy, but I know a friggin' 7.3 will need a wicked built motor that cost more than the entire z28 just to see it's tail lights. Especially if we are talking about an LS1 6-speed here. 320whp from the factory. You can keep those stupid things though, just changing sparkplugs ya gotta be a contortionist or pull the motor or subframe. I don't know how you guys can deal with it.
373 to the wheels with cam tune headers and full exhaust
320 is a bit of a stretch, in most cases your lucky to break the 300 mark with all the free mods, and as beating the same guy all depends what year the ws6 was, starting in 94 Was the first ws6 t56 package but as a lt1 then in 98 was the first ls1 f body then in 02 gm ran out of ls1 and stuffed a ls6 in some cars so basically it all depends on the year, auto or man, and mainly the driver mod as I call it lol
The guy I've raced has the Ram Air hood with 4 openings instead of 2, and it looks more like a "bubble" than the first years. I'm fairly certain it was one of the later years based off of that, but I am really not that brushed up on my F-Body history. It was a manual trans.
You guys don't know a perfectly good threadjack when you see one 
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