Some really interesting Dyno results for various tuning tweaks and combinations of Model A Ford Flathead Four Bangers on this excellent site.
STOCK MODEL A FORD ENGINE, “A” CARBURETOR ON BORED OUT “A” MANIFOLD
STOCK MODEL A FORD ENGINE, “B” CARBURETOR ON “A” MANIFOLD
STOCK MODEL A FORD ENGINE, “B” CARBURETOR ON BORED OUT “A” MANIFOLD
STOCK MODEL A FORD ENGINE, WEBER 32/36 CARBURETOR & INTAKE MANIFOLD # A-9510-W
STOCK MODEL A FORD ENGINE w “C” HEAD
“C” HEAD, “B” CARBURETOR & A MANIFOLD BORED OUT TO B SIZES
“B” HEAD, B CARBURETOR, A MANIFOLD BORED OUT TO B SIZES
SNYDER HEAD, STOCK ENGINE, A CARB & MANIFOLD
SNYDER HEAD, B CARBURETOR, A MANIFOLD BORED OUT TO B SIZES
SNYDER HEAD, B CARBURETOR, A MANIFOLD BORED OUT TO B SIZES , ARIES MUFFLER
BRUMFIELD HEAD, STOCK ENGINE, A CARB & MANIFOLD
BRUMFIELD HEAD, B CARBURETOR, A MANIFOLD BORED OUT TO B SIZES , ARIES MUFFLER
BRUMFIELD HEAD, DUAL STROMBERG 82 CARBURETORS, BURNS MANIFOLD, ARIES MUFFLER
SCALDED DOG, CHARLIE YAPP’S VORTEX DUAL ZENITH INTAKE MANIFOLD
See the rest and much more here