I have a set of Buick heads with D&D rocker shaft supports and finned aluminum valve covers. A lifter stuck and over compressed a spring causing pushrod and valve spring failure. I still have 15 pushrods I will throw in. More info, pictures and pricing later.
Pm for contact info for pics, they do not want to attach.
I have a crower 50229 cam as well, used with matched lifters. Barely broken in $100 plus shipping.
I would buy the valve covers. PM sent.
I boxed up the heads( with bolt, push rods, rocker shaft with d&d supports) and the cam for a gut that backed out. $400 shipped( in the states).