find a 24 granny
find a sierra
pull the engine out the the 24 complete with crossmember
get a rwd mt75 box
bolt them together
bolt the whole lot into the sierra
wire it up as per mob's site
job jobbed
or
get fitz to wire it up for you

that said, i've seen him do a drive in and drive out (ok, it was a really rushed job so it didn't look all that) in about 90 minutes from going onto the ramp with a dohc to coming off the ramp (under it's own power) with a 24V