7m's are notorious for blown head gaskets and bottom end failures but are almost a direct bolt on. Motor mounts are the same, bolts to stock trans but may not hold the power for very long, you would need the oil pan off of the 5m to put on the 7m, stock drive shaft can be used, and for wiring there is a guy on
www.celicasupra.com Jim king who makes a plug and play harness for this swap. I would suggest looking into the 2jz-gte swap though, more reliable engine and higher power.