Assuming healthy actually means not ill, and not just that he won't die, base Kimimaro takes it low-diff at best, and no diff at all with his V1 curse seal.
There is no one alive that Kimimaro can't take on in CQC, thanks to Shikotsumyaku and how versatile it is, and since Pt 1 Lee and Neji are entire close-quarter combatants, they have no chance. Larch Dance makes him untouchable. His ability to increase the density of his bones to make them stronger than steel makes him indestructible. That, plus the fact that he can use his bones to effortlessly counterattack, shits all over anything Lee and Neji could possibly hit him with.
Even with Gates, Lee might get one hit in, at the cost of shredding his leg apart against Larch Dance and not being able to follow up. And it wouldn't even be that effective against Kimi's super dense bones. At that point, Neji is a non-factor anyway. There's just no contest.