P4529117 is a newer number for P4532060. Same manifold, different part number. I found a pic of the P4532061 and it looks identical to the other 2. These are nothing more than aluminum versions of the factory cast iron HP manifolds.
I used to have the RB version on a 440 years ago. It's exactly the same as the cast iron piece...weight savings is the only advantage.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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