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you want a street/track truck, right? Personally, I would start with a 4WD or AWD model and turbocharge whatever engine you decide to go with. Then you will be able to hook in almost any road/track condition. Sure, it will increase weight and reduce drivetrain efficiency, but most races are won the first few feet from the starting line.

But to answer your original question, I have personally seen a turbocharged LT1 put nearly 1000horsepower to the rear wheels with the stock block, and that was spinning the tires on the dyno back in 2003~4.
 

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You guys priced that 18* crap??? Yikes! From the heads, to the intake, to the shaft mounted rockers. $$$$$$$$$
You answered this yourself.

If you're starting from scratch, this setup would probably offer more bang for the buck.
Are 18* heads more expensive to top of the line 23* heads?
When buying new, an 18* intake cost right about as much as a high end 23* intake. Same for the rest of the parts in an engine.
 

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