Hello Tatey,
In my experience with the CVH i would remove the sump and head and remove each piston and check for any play or signs of wear on the big and little end. Both sets of shells are quite easy and cheap to replace and also the piston rings while you're at it. With mine the cvh was running sweet in the donor car but as soon as it started getting pushed the big end went to the extent that a crank regrind just wasn't worth it (well thats what i told the good lady to upgrade to a new zetec).
Also check the hydraulic lifters, these can fail or oil ways block after high mileage and again are not too expensive to replace. Also when modifying the sump retain as much volume of oil as you can with the pick up pipe in the correct position, its also worth adding an oil pressure gauge on the dash just for peace of mind.
Just from my experience but that is my plan with my next cvh.
Enjoy.....AndyH
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