If you want to keep it cheap, these used to be my go-to MLS head gasket set (as recommended to me by GTOrange): https://kerzan.co.nz/index.php?route=pr ... earch=6g72
I've since switched to using genuine Mitsi MLS head gaskets. Don't know about thickness, never cared enough to measure them.
Off the top of my head, the overall head thickness/height can be measured and compared to the numbers in the manual. I'll see if I can find it.
There are also depth indication castings in the bottom of the head that wear down as you plane them.
Re. the blue car, I didn't touch the bottom end internals. It was done by a local engine reconditioner that I recommended. They've always done good work, I haven't had any issues with them and wouldn't hesitate to use them again. Anyway, it demolished main bearings (and cranks) on the dyno both times, both while being wound up on E85, both by the same tuner, both times on a horrible old Australian "EMS" aftermarket engine ECU. Funny story, it was the same shop that ran my car on the dyno with the front wheels strapped down - well maybe they didn't. Or did they? Who would know. I blame the tuner.
By that point I had left the motor trade, a local workshop pulled it all apart, the engine ended up going off to someone that does Evos and then the car went over to Tauranga to be tuned as recommended by the new engine builder. They finally threw the EMS ecu in the bin and wired up a Link. Something was done to the oiling system in the block, I think the galleries out of the oil pump were taken to with a die grinder to increase flow or something along those lines. You'd have to ask the owner if you want more details. No problems since.
4 bolt block & stock crank. It's on a new genuine crank at the moment.
If you want to track down Steve, go open an account on 3si and reach out to him, his user name is stevecooper or something like that.