[snowman]

Dude, if the tensioners failed your engine needs a total redo. It means bent valves, holes in pistons, ect.

I would require a mininum of a leak down test, compression test before doing anything. Its likely to still be bad, but at least you will know what your are fixing. Just guessing that the chains and tensioners are bad, replacing them could be a major waste of money if there are holes in the pistons or bent valves.

Its generally less expensive to diagnose and then fix than to fix and then diagnose and fix.

Best of luck to you.