appearance of a 340 vs. 360

I'd build a 360 without a second thought if I did it again. Other than to be able to say you have a 340 there's no real good reason for it. It might impress the folks who know the reputation of the 340 but don't know what the potential of the 360 with the same build would be. Assuming the 360 had been available during the horsepower era I don't think too many people would have gave the 340 any consideration.