Ideas on what's causing my click/tick/rattle noise?

Comments about post #114.
- carbon; looks like oil getting into the chamber. Piston ring failure, worn v/guides &/or seals. Also most important: check the wear of the ring grooves, up/down, in the pistons. Worn grooves make excellent oil pumps....
- looks like a tremendous amount of coolant/crud around for just 700 miles.