Also want to point out that the ZZ series of big block motors all have LOW tension rings to reduce friction and free up horsepower. People expect more from a big block than it can deliver with pump gas due to the poorly designed 1962 technology heads.
The open chamber design helped (1968 technology but in order to obtain the 12.5:1 static compression (Sunoco 260 back then, race gas now) it utilized a huge hemispherical dome. Todays engines use small heart shaped chambers with flat top pistons which the 121 cc open chamber BBC head doesn't have. As a result the engineers at Chevy tried every trick in the book to free up parasitic drag, installing oil control baffles, and even reducing the chamber volume slightly to attempt to get one horse per cube to simulate a high horse motor. Of course a 406 SBC will blow it away but it doesn't have the same charisma.
I overcome the deficiency of low performance big block heads by building a BBC of around 600 or more cubes and then putting a 396 or 427 decal on it (usually I claim it is only a smog era 402 if I think I can get away with it) to get that desired torque that a SBC can not match. They all look alike on the outside if you build a standard deck height block.
I was going to mention that myself, but I've been posting about oil control issues for some time now on the ZZ big blocks, and didn't want to bash the OP's motor choice.
But now that it has come up again, I would never
buy another ZZ BB oil burner again.
And about those low tension rings, at the time I had my problems (with 2
ZZ 502 motors) there were no aftermarket alternatives available for them. They are also narrower than any other oil rings I've ever used..
I didn't want to have buy conventional pistons and rings , so I had to pay $50.00 per ring set for EACH piston.
Also the cylinder bores looked terrible, and needed a hone using a torque plate.
The heads too needed to be gone through and a decent valve job done on them.
This was on a ZZ 502 that had less than 1000 miles on it! I had to do something, it used a startling amount of oil. I'm talking over a quart in a couple of hundred miles. The whole engine got a complete overhaul.
The reason I had to pay myself instead of warranty was because it sat in the crate for a year and was out of warranty on time.
On a positive note they make great torque and are fast when they do run.