What should my 360 run

Moparhead said
The x heads have had the ports cleaned. They will be as good.

I don't see the 360 giving up anything to the 340. I would "guess" the 360 would net you a better time. You might have to shift 200 rpms sooner with the 360 using the same cam as the 340, but from my experience, the 360 should run a little better