2.02 or 2.055 valve?

You should be more than happy with the original 1.92" and 1.625" size. I've gone 11.31 @ 3,540 lbs and there are lighter 360's that have been well into the 10's with 1.88"/1.60" valves with OEM heads - not ported, less cam lift and 10.5-1 compression! You can always go bigger later, especially if you upgrade the rest of the combo also. For now I think you could use the extra velocity and bottom end from the 1.92" valves. Valve job is much more important, although I believe they come with a factory valve job already. Just not sure how good it is. Have it touched-up. Comp Cams has .100" longer than OEM Magnum valves available at 1.92" and 1.625". The longer valves will open up your spring options. The heads are based on Magnums and the LA-X and LA-M are exactly the same, except for being machined for their respective rocker arm set-ups. OEM Magnum valve lengths and installed heights are shorter than typical LA heads. But you'll have to measure the installed height to see what you end up with first.