I would also check the oil pump chain on the bottom in a turbo motor. If it has had decent care the cam chain will probably be good but the pump chain is very short so will get four or five times the wear in a given mileage. and if it breaks it is catastrophic.

I believe that is what happened to Craig's motor and I know he is pretty good about keeping clean oil in it.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.