These are the minimum recommended in the AMD desktop builders guide circa 2002 for a certifed 300W power supply for a Socket 462 system.
+3.3V = 28A
+5.0V = 30A
+12.0V = 15A-18A
+5VSB = 2A-2.5A
Your capacity on your 12V line is too low even for a socket A system let alone a K8 based system.
You may be able to just squeeze by with a very simple minimal build, but don't count on adding any drives to it.
MD
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Mainboard: PCC M848ALU / ECS L7S7A2 / ECS 748-A, HDD: Western Digital 40Gb, RAM: 2-256Mb DDR266 by Micron
4x AGP Card: 3DForce4-MX440, CDRW: Liteon 52x32x52, PSU: Antec True430, CPU: XP2200+ (AXDA2200DUV3C)
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