"451 Manifesto"

The main advantage of the 470" over the 451" (besides the +19 cubic inches) is you use the 2.20 chevy rod with .990 pin. It's a cheap, lightweight and plentiful part. This also opens up more possibilities when choosing a piston.

The benefit of rod ratio has been a hotly debated subject for years. Lingenfelter did an exhaustive study years ago and found very little to be gained from any particular rod ratio, certainly not enough to be worth basing your engine build on. IMO you should pick your rods based on strength, weight, availability, and placing the pin high enough on the piston that it's light but still has room for a good ring package.