So I'm getting ready to rebuild a 340

Real word example:
340 - .030 over
Sealed Power Hyper flat tops
SCAT I beam rods
Comp XE 285 HL cam https://www.summitracing.com/parts/cca-21-228-4/overview/make/dodge
RHS heads, with LA rockers and intake
Antique Victor intake
FAST 2.0 EFI (carb results should be similar)

8" Tight converter (Still a bit too loose, needs a 9.5 Lupo or similar)

In a 70 Duster, 3300+ lbs, full exhaust, 30" tall MT drag radial and 3.91 gears.

91 octane swill = 11.44 @ 117. ***Shifting at 5,000, crossing at 5,800. No, those are not typo's...

Very capable of being driven daily. Very good street manners!