i havent doen one, but there are companies that sell the sbc motor swap kits... the main issue will be dealign with wiring.... you are going to need either a donor vehicle harness and ecu basically..... and going to need to tap it into the toyota system,well, maybe not depending on what needs to be setup... you will need the ecu though of a 350 if going FI
once you have the mortor mounted, its jsut a new transmission mount basically... and some custom driveshaft work..... plus you gotta figure out your shift linkage or shifter....
i wouldnt attempt it myself, but with a competent welder and a little research it probably wont be that bad.....