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The holley SD is a good intake, and likely won't see a 1/4 mile diff between it and the RPM in your application. However you didn't say what kind of heads, porting and cam specs. That's what tells us how serious your motor is about needing intake flow.
 The SD is an excellent intake and does quite well in comparison to the RPM. Considering they are much cheaper because they are used it kind of sweetens the deal. However if you already have the RPM there is not going to be that huge of a difference between the 2.
'73 GK6 Challenger Rallye - 340 4-Speed
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