It's a good size job, remove valve covers, front cover, oil pan (you might be able to do it without removing the oil pan. Remove oil pump houseing and change out gears and put your timing chains back on.
Are any of the bolts tty? Before you pull the timing chains do you mark them with somepaint so they go back on the same place and just have your key way on your crank at 12 oclock be for removing the chains?
did mine while the motor was out.....but when i put it back together one of the chains was off by 1 link so i had to pull it all back appart in the car....f that its a pain