Where to degree my cam?

What's the vehicle purpose? Do you want added power up high or down low? With the low 1st gear in a standard transmission with a sub 3000 vehicle, I'd go straight up or < 4 deg retarded to delay the power band to a more usable area. Although you might be lacking enough exhaust flow with log manifolds, then again, it is a relatively small cam. From the look at the cam card, it sounds like they designed it for a 340, and the valve events may be based up on that. A 360, having a slightly larger stroke, will have a tendency to "soak up" some cam duration attitude. Meaning it will act a little smaller, if at all noticeable. Make absolutely sure you have proper piston/valve clearance, especially when changing cam time events.