Years ago I did a mild 340, then took the heads, intake, cam and did the 360 block. Tried to get the same compression ratio. Same car, gears, exhaust, etc etc.... the 360 went 3 tenths faster.
I'm not saying the 360 did or didn't make more overall power, but at least some of that 3 tenths could be that more than likely the gears and stall suited the 360 better.
One of the main reasons to go larger less gear and stall generally needed.