trucks didnt come with spool mounts,IIRC so thats out for a sb and spool type mounts,gotta chop the /6 spool mount and reweld it in the spool type k-frame for sb v-8

IIRC,you need to cut the pass side and maybe the drive side mount off the k-frame and move it around some for a BB on the bisket type k-frame,may have to add a notch to it also some where on the drive side

other mods would be welding it all up on stock welds and adding a skid plate and reinforcements to it while your modding it for mounts,

myself,I would just use the conversion mounts or bolt up a BB k-frame