I got mine from TA Performance.
They were the only vendor that said if it didn’t fit , they’d take it back & swap out to an undersized timing set (as long as it was only installed for mock up).
Tend to not forget Mike from being so accommodating .
X2 on Cottons’ for the valve spring tool .
They might even have available the RollMaster Gold “IWIS” chain & timing set.
They come in standard size or undersized if your engine has been line bored or line honed
BLM’s are fine 👍
Almost dead nuts on , remember 128 +/- 10 is within the acceptable window . At
125 , your ECM is pulling just a hair of fuel (so yes , engine is a tiny bit rich), but nothing to worry about .
What’s your AFR at WOT at the top of 3rd gear? 🤷♂️
The stock headlight retaining rings are silver (believe they are stainless steel).
I elected to change mine out to black to match the GN’s dark theme.
Had no issues fitting Hella 4”x6” headlights or 4”x6” Projector LED headlights with my original retainers
Grab the double ball bearing 5857 or 5858 turbo with 4” S Ported Shroud & a David Husek (Turbo Buick Performance ) 3021 Lock up Torque Converter & you’ll be all set . Add a Lorenz adjustable manual boost controller & you’re good to go!
Hang on and get ready for low 11’s or better , but...