Here's the picture again, I hope it works this time:
The heads were new when I purchased them and are not milled, as well as the block.
Pistons are flat top TRW , head gaskets Fel-Pro #8548-pt 1 (0,047" compressed)
The camshaft is an Edelbrock Performer RPM, valve springs are the correct ones for this cam. I isntalled the cam straight up and checked it with a degree wheel.
I did not expect any problems as all the components are sold as a matched kit by Edelbrock. They even had an engine build sheet on their homepage using exactly the same head gaskets and pistons. CR is 9.5:1, so this is a fairly mild street engine.
The RPM range of this camshaft goes up to 6500 according to Edelbrock, so the springs should take this RPM. Pushrods were hardened Trick Flow. However in case of over revving the engine I'd also expect the exhaust valves to hit the pistons first?
The engine was still running strong, I did not notice anything that sounded not normal.
I will disassemble the bottom end next and take pics of the bearings. Pushrods looked straight, I will check them again on a glass plate.