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From the research that I have done any 400 block would be a better choice for rigidity than any 440 block out there from a stock factory block standpoint, as long as they sonic good.jmo

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X2. If a stroked "B" will get you the cubes you want then it's a better choice (my limit is 470 which is using an offset ground 440 crank) including it being lighter & a MUCH better fit in an A body. If more cubes are needed then go with the RB block, my next one is going to be a 535 (30 over 440 block) . Not sure whether to get a kit (440 source maybe) or an Ohio crank/some eBay chebby rods/& the KB pistons for that