@340inabbody you mentioned nothing else about the rest of the build besides stroke so let’s start there.
My ‘68 340 GTS sports stock manifolds and exhaust, a 284/484 cam, edelbrock replacement 625 carb. It needed to be rebuilt. I went the 3.58” stroke route given the limitations of the intake and exhaust systems.
My oldest son built a 4” stroke motor, ported aluminum heads, single plane port EFI system, race headers and 3”
Exhaust.
Both work great for their intended application, what’s your application?
Cliff Ramsdell