all the goodies, solid cam, elderbrock alloy heads, victor jr intake,roller rockers,etc etc etc.
big horse power done right, prep work 2 years, wise man said " you clean it and then clean it again and when you think its clean, clean it again." this has cost less than $5,000. looking at 10 sec quarters in street driven car.

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$5000.00 for 600hp thats very impressive in my books

How and why so cheap???

parts are all out of the states, cheaper there than here, horsepower comes from being thorough with your torques and measurements, carefully cleaning,de buring,porting, polishing etc.dont rush the job and "no it'll be right"thinking.
the xb is for sale if you know anyone looking $23,000
cheers