Timing chain on a 70

[Blown 331]

A buddy of mine has an ATC70 and it makes a lot of top end noise and the timing chain is very loose, we thought the roller was missing but it is in there. I'm at work right now and he is trying to change it and he said it looks like you have to split the bottom end to change the timing chain. Sounds kinda odd to me but I'm not looking at it so I don't know. Any tips?

[Blown 331]

No one here has ever put a timing chain in a 70? That's weird. I guess since I will be pioneering this procedure for 3WW I will post my results.