I ended up ordering VR1 10W- 30 with NAPA Gold 1258 filter (larger of the 2). I have not changed the oil yet. I have read that 5.7 litres (6 quarts) is the right quantity to use with filter change.
As far as the build, the guy I bought it from said he paid $6K to have it built to Ram Air lV specs .. O port heads, rolling lifters, and a Ram Air lV cam. He couldn’t give me more information than that. This is an original 400 car, but he told me the engine was replaced in the early 70’s with a 68 GTO 400.
I will post a picture or short video if I can figure out how to. Thanks
