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set up right you shouldn't lose any power at any rpm (over 1,200-1,300) from a vintage Paxton. In only a hundred rpm or so they are making much more power than it takes to turn the pulley. At 2,000 rpm I'm producing 2 lbs. boost, at 3,000 rpm it's over 3 lbs. Jetting is not always easy and you have to be patient to get 100% of the potential.
Otherwise, If you've decided against supercharging, for about the same amount of money, in your place I'd get a set iron heads that have bigger valves, and flow decently, like these:
World Products 053030-1 - World Products Windsor Jr Cylinder Heads - Overview - SummitRacing.com
another cam suited to your needs
a 650 Holley carb
a 2.5" free flowing exhaust system like the magnaflow stainless
that should be enough to add substantial horsepower increase over what you have now at a cost of only $1,500 for all the about items.
Z.
p.s. re my previous post; I've been ripped off on a car purchase before, so I'm not unsympathetic to what you are going thru. Just vow to learn from your experience. No one gets thru life without a few scars...
Z.
