Here is a link to a comparison on different manifolds for a 302 :
http://www.jason.fletcher.net/tech/intakes/intakes.htm
Low RPM HP
Ford cast iron 141.4 HP @ 2750 rpm
Edelbrock low rise performer 136.1 HP @ 2750 rpm
Edelbrock F4B 138.0 HP @ 2750 rpm
Max HP
Ford cast iron stock HP : 215.1 @ 4500 rpm
Edelbrock low rise performer HP : 233.7 @ 4500 rpm
Edelbrock F4B high rise HP : 231.0 @ 4750 rpm
High RPM HP
Edelbrock F4B 219.3 HP @ 5500 rpm
Ford cast iron 197.8 HP @ 5500rpm
Edelbrock performer 188.6 @ 5500rpm.
Edelbrock F4B 219.3 HP @ 5500 rpm
Either Edelbrock manifold will make more HP than the stock Ford manifold.
Jeff
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