I bought my 69 912 with a grenaded motor. It took me about a year to assemble the various pieces and parts to build another one. One of the last pieces to the puzzle was a pair of NOS factory heads.
When the package arrived, my years of experience in shipping/receiving taught me to open the smashed box in front of the UPS driver which revealed that all the fins on one corner of one of the heads were broken off. 30 years sitting in a warehouse and they didn’t survive a 3 day UPS trip.
I fought with them for about 6 months and ended up getting $70 out of them. The shipping charge.
The day I finally got it installed, after 4 years. I wish I’d have taken some pictures of it before I installed. It was clean enough to eat off of.