I scavenged up a whole bunch of leftover flathead go-fast stuff, Dad's and a few other oldtime racers, back in the early 1960's when I built my 47 Mercury convertible. It was a fairly conservative build, .080 oversize, 4" stroke Mercury crankshaft, steel tubing headers, dual exhausts, and a set of Offenhauser finned aluminum heads. That one was pretty hot, and I kept the car for 13 years. A nasty divorce and a desire to keep on eating occasionally finally made me sell it out in central California. I haven't built up another one since then. Good engines, though!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!