I'm still a fan of cast iron rings, for me they always seat. Had bad experience with moly, and no tq plate. The cast may not last as long, but few of us go 50k without a rebuild. My junkyard Bonnie 73 455, never saw a machine shop. Ridge reamer, dingel berry hone, cast rings, still going after 10 years, and 20k miles, uses 1/2 qt between changes.
Ps-read once bout using borax or comet, in spark plug hole to seat rings, never tried it though. A mechanic I knew when I was a young boy, told about a service bulliten in the 50s, at a Ford dealer about new cars excessive oil usage, it said to use borax in plug hole, he said 9 out of 10 worked?
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 1970 amc rebel 4-door, faded blue paint,290 emblems on car, 455 under the hood.Turbo 400,3.15 gear.
Best so far 1/8 et,8.90 on street tires,
Since that I have added 400 heads.
I call it a rat sleeper.
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