That is the former Phil Glass car. David Garton found the car and mechanically restored it. It is OG paint and Blair Patrick built the engine. No maybe to the story its real deal!

I can confirm that, I was a small part of it when the car came up years back.  David researched, bought and got it back to it's glory.  Very cool ride, and nothing he owns is junk, lots of cool toys.

In an engine like the 462 above, changing a Felpro 1020 to a 4.20 bore only gains .084:1 compression, 10.315 to 10.399.  Not sure I'd bother for the money.

However to answer the question, I have only done a couple at 4.375 and used a 4.40 Cometic and worked well.  So I would not be afraid of a 4.160 engine, assuming a properly prepped flat surface and a Cometic with a 4.190 or larger bore. 

Test fit if going close though, because every so often you get a weird one from Cometic, not common and I use them all the time, but have seen a couple that the bore was not centered

I’ve been fighting with finding a gasket that I like lately… last set I ordered from cometic 4.165 bore gaskets and they were measured 4.200-4.320 depending what clock position you pulled the calipers across… just a FYI. Not sure why their gaskets aren’t concentric with the list a bore size. Only thing I can surmise is they are compensating for the old iron cylinder head chambers being wider at the valve centerline/pierce point than the bore size is. Just trying to save you the disappointment of spending good money on gaskets just to not get what you want. Good luck

That wider T-pan sump makes the oil level lower (closer to the pickup) for a given quantity of oil

It's the amount of oil.   No wonder the lifters were clacking.

If it's a Canton T-sump oil pan, regardless if it's the higher end road race pan or not, the *system capacity* is 8 quarts.  That means 7 quarts in the pan, 1 in the oil filter.

You're still running too low of oil.

x2!