Mazda B2000 motor??

[mazda power]

hi all, hows everyone doing?
i'm looking for help from the mazda community, cause my 87 mazda B2000's engine just died on me friday. the radiator developed a leak and it overheated and lookds to have either spun a bearing or warped the head, i haven't had the time to open it up and find the extent of the damage yet. i was wondering if anyone knew of a palce to get low price reman mazda motors either in Kansas, or someone who will ship them here?
or if any of you have swaped the motor for a chevy 4.3 v6 and have any suggestions about that? any help would be greatly appriciated because i miss my truck greatly and would like to get it back on the road as fast as possible. thanks everyone!