with no (or fewer) restrictions in place this guy brought a 4 engined DC-7 to a pylon air race against the likes of P-51s and P-38s. Something akin to taking tanker truck to the Le Mans 24 hour with the goal of not ever stopping

http://www.metafilter.com/139042/When-Un…

http://www.adastron.com/lockheed/const…

of course, only to be beaten by a regular race car with extra fuel tanks added :)