340 vs 383

It boils down to a engine builder that can build power. Period. "size doesnt matter".

The formula is (what you have for parts and starting point) + (what you can do or get yourself or for free) + (cost of parts to make the package work) / $$$ = desired result
I dont consider cruise night impressing ability when I designa powertrain...lol

IMO, a 3.58 stroke 383 will out power a 3.31 stroke 340 as a stoplight/cruise night car. A 3.58 stroke 360 will go one step further, and attach to everything the 318/340 did. So, you have a 340 core. You can sell it, buy a 360 done, and drop it in witha few minor tweaks. Or you can go thru the 383, build a tranny, and go with that. Same same really. You give me a hp number, I'll reach it assuming the $$ is there for the work required. Displacement is just a relative thing. A 4" stroke small block will out torque any std stroke 440 when built similarly.