longhunter:  It is likely the serial number is actually 358048.  It is real easy to misread Krag #s.  The 3s & 6s often look like 8s.  1899 receivers were built as carbines.  What is the length of the barrel on the 1899 you are considering?  What kind of stock is on it now?  What front sight is on it?  Original Carbine hand-guards and rear sights cost a lot on the collector market.  Photos would help others give you guidance.