Another Ls to Nv4500 question

[jonesky2]

After lots of reading about this swap I odered a RAM 1550 flywheel a few years back when i was getting my 5.3l built. come to find out everyone is getting the RAM 1550X flywheel wchich the .400" thicker. Does anyone know if my Ram 1550 flywheel will work or do i need to go buy the RAM 1550x? Im hoping I can use my flywheel I already purchased. I got it balanced to my rotating assembly when I had my motor built. and on the pilot bearing do I use the ls7 or the Ls2 and lastly any recommendations for a clutch for 600-650hp preferably a non dual disk if possible