Win98 SE is useless when it comes to 2CPU configs I would highly suggest using Win2K pro + SP4 with a Dual Boot for that setup.
98SE even with Un-Official Service packs will not give SMP support, it's limited to one CPU only.
Unless you have found a way top bypass that, yet I hardly doubt that since 98SE was not designed to work with Multi CPU platforms anyways.
But quite a decent setup there if you plan on using 2K on it or so