2 questions on the M116 4.2-liter V8

[retroguybilly]

1. Can anybody give me a link to a thread on DIY timing chain and guide replacement?

2. Why does the service manual for the 420SEL tell you to pull the engine and transmission as a unit? Is it too difficult to pull the engine alone for some reason? Maybe the bell housing bolts are too hard to get to or something?

Thanks again for all your help.

retro (Bill Crowell)