Bill Dedman is gonna get a woody when he sees this......
Then what I recommend to you would be to build a turbo motor. Them little turbos like what come on any of them modern 4 bangers would work good, and be cheap outta a salvage yard. They also do not require expensive exhaust headers and can be used with stock compression engines....even with stock pistons as long as you watch your fuel curve and don't lean out. I really think doing it that way, you would come out the cheapest. You might not be able to keep it at 1500, but then again, if you lucked out on deals.......who knows?