Did you test the oil pump for pressure? If you are getting 0PSI you should have really checked to make sure it was still pumping correctly. Running any pump dry, (0PSI) is very bad for it.
Or it will cause quenching which will make the bolt MUCH harder. I believe he meant heat the bolt up enough and then try and turn it while it is still really hot.
My quick answer would be to buy a small fuel pressure gauge and put it on if its a Fuel injected car. This way you can see if you are losing pressure over time.
That stock MAF is going to choke the hell out of the aftermarket TBs. I'd try and borrow a pro-m 80 as well. You will see a bigger spread and more gains.
You need an oil fill kit for the trickflow valve covers. The kit does not supply you with one. You will notice you can't get oil in your engine easily without it!
Make sure you use loctite and lock washers. There is alot of vibration that could rattle that loose.
If it comes loose, there will be a HUGE mess. I'm not even sure it is worth the risk.
I'd buy one of those filters for the PCV rather than that.