On a mild build like yours, the performer rpm would be my choice. The cam is small and the gearing is relatively tall (3.55) so you need an intake that builds torque while being able to move enough air up top. My buddy has a build very close to yours with a little more cam and gear and he runs 11.80's with the performer rpm. The car is heavy as well (3700 lbs).
Wow, thats extremely quick for the weight of the car. Do you happen to have the specs on that build???
Marcus
Sure Marcus ;
446 ci
six pack speedpro pistons
915 heads with 2.14/1.81 valves
Performer rpm with a 750 double pump holley
MP 509 hydraulic cam
Hooker Comp 17/8 x 3 headers
727 with 3500 stall
4.10 SG with a detroit locker
Caltrac traction bars with stock leafsprings
MT 28x11.50 et drags (slicks)
All this in a full street trim 73 Cuda that weighs 3700 w/o driver. The car is super consistent and he and his son go lots of rounds and bring home the bacon on race day.
I had an old TM7 race single plane with an 850 dp holley carb and lent it to him to try out to compare to the Performer Rpm/750 dp. Well the car lost torque and was slower in the 1/8th mile and 60ft times. He said that it did feel a lot weaker on the bottom end compared to the RPM intake and that was reflected in the timeslips.
This engine is probably a legitimate 450 hp combo so it's not using up all the Performer RPm's plenum while taking advantage of the increased bottom end power the dual plane produces. In contrast, my own engine was choked off by the RPM but it's a much stouter build making almost 100hp more than my friends. In that instance the Street Dominator showed it's stuff on the Dyno testing we did when comparing the two. I went with the Street Dominator because with a 4200 stall ; i wasn't too concerned with what the engine is doing below that threshold and focused more on the top end power....where the engine will be shifted.
It's an apples to oranges comparison with a mild iron head, hydraulic cam combo compared to a stouter solid cammed, ported aluminum headed motor that pulls well to 6500. Each respective build requires the proper manifold to make it all work well together. You could swap manifolds between these two motors and they would work pretty good....but you wouldn't be getting the best of either of them with the wrong (mismatched) intake.
Hope that helps.
Ron
Ps. Here's a pic of the two jokers in the winner's circle, again
