[khansmith]

This is good stuff so far. Let me summarize results against the question posed "Could you build a "green" powerplant that looks and sounds like a classic but passes today/tomrrow's EPA standards? EX Could anyone build a 427FE Side Oiler engine (or an engine that looks like one) that meets today's EPA standards? ":

ROUSHAC: No Solution (unless you can travel back in time)
Aussie Mike: Yes w/ alt fuels, turbos & EFI
wtm442: No Solution (but believes modern engines will continue to grow hp)
Ronbo: Yes w/ expensive EFI, Exhaust, Sensors, etc (est $20K additional)

Please correct me if I am wrong.