I'd pick the second one. The tighter LSA will help keep up cylinder pressures..and possibly give you a *little* thump on idle. Plus, it will probably work with stock springs...both size and pressure. Make sure you buy new lifters (the cheap Howards lifters from summit), and run a designated, by the book break-in and you should be good to go.
You won't need a bigger than stock converter with that cam.
