Been asked this by PM but no doubt will be asked again so to save time will answer here:
I originally (foolishly) thought I could build a 3.4 stroker engine myself but ended up cocking it up and melting pistons. This resulted in my original head getting damaged so I brought a second hand bare head from Keron on here but at the same time was offered a Brand new complete head from another person so brought that too.
The new Toyota head got put back on my now rebuilt stroker which after getting properly mapped by Ryan on here went like a dream but I cocked that up too and quite quickly mashed the main bearings.
In the mean time the Second hand head got built with the Brian Crower cams Springs & titanium Retainers got put on an n/a bottom end which I was still using up until last weekend.
So to answer your questions the standard head is virtually as new done 1000 miles and the other head is undamaged however the cams both have slight scoring (from the first engine fail) on the first journal (?) at the cam gear end but have both done around 6000 miles in that condition since then with no problems.
Anyway I have got bored with the 2jz now and am fitting a 1uz v8 which will be turbocharged and give me what I was originally looking for with the 3.4 stroker, loads of torque + loads of power