appearance of a 340 vs. 360

And since that is under the car, no one will see that tip off.
The oil pan itself is a bit wider at the crank seal area than the other ones, the embossed displacement on the drivers side of the block, the stamping on the block, under the drivers cylinder head, but I think super vision is needed or an eye ball within inch's. and the balancer, which is also hard to see. I personally don't car what the displacement is. You call it a 340, fine, it could be anything and I don't care a bit.

If your going to use a 360 in place of a 340, 99% of all people will never notice.