I also run a 1397. What are you looking for exactly? I wouldn't bother with a 1363 since you're already there and changing out the block. The cost is the same for either block and there isn't much difference in terms of heat. Use a muzzy fan for extra cooling and you're good to go
You have a multitude of options in terms of parts and it all depends on what your goals are. You can make anywhere from low 190s to low 220s on motor alone with a properly built and tuned 1397.
Tell me what you want and I'll try to tell you what you need