Ok , need to step back

67Dart273 said
What IS a 470, B or RB?

B block 400 w/a 3.90 stroker crank.
(That’s IIRC...)
Scroll down on this page;
Stroker Kits-440 Source

400 >> 470. (3.915" stroke/6.535" rod) Approximate Bobweight: 2160

This kit is a great choice for an engine that will see a lot of street use, but still make some serious power. The low deck, 3.915" stroke