Any version of Stormbringer is a good start but I prefer the earlier ones.
Things I would change.
Full HP (CON + SIZ)
Skills over 100%.
Attribute Skill modifiers.
Starting skill percentages: not a BRP option, but I would allow players to start new skills at 40 - 50% at lowest. Conan was forever picking up new skills and mastering them fairly easily.
Additionally I'd be fairly generous with skill improvement rolls. The curve flattens out, so its good to get them up to a level were they can split attacks and do ripostes.
BTW Ripostes are one of the BRP options that never made it to the BRP book.
Magic will be evil and dangerous and will probably invole lots of blood sacrifice in order to generate Magic points.
I would also add Hero Points as used in HeroQuest / MRQ in order to turn a failure to a success or success to critical.
Finally, I would also add a Pendragon Passion or two. One would be the Characters main driving ambition. List it as a % based on a relevant attribute X 3. When in a situation where the PCs main ambition is at stake, make them roll. On a success they get +50% to any skill they use. On a critical give them. +100% to anyskill used during the time the passion is active.
A second passion may be a GM derived cultural or professional one. Between these two, it will help drive the story and allow for moments of character glory.
Likes to sneak around
115/420