You could just get away with replacing the valvetrain (or entire head), lifters and do the LIM gaskets while you're there and be good to go assuming the pistons are good. No need to replace the chain as they rarely have an issue. Being his work car I doubt there is a huge need for a forged bottom end (with another $400 for machine shop) and all that. Methinks his wife would probably put the kabosh on that idea real quick anyway, lol..