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LT's or Mids make a pretty good difference. But, most people will usually say shorties suck. Mine had shorties on it when I bought it, so I don't know if they were any better than stock manifolds. But, going from shorties and a cutout, to LT's and true duals, was a night and day difference. Both in sound, and performance. I do know that you had some pretty good results with shorties though. But, maybe the BBK's were a lot better than Edelbrocks. Didn't you make 360rwhp through a stalled auto and shorties with a CC306, on stock heads?
I never dynoed my setup.(you probably remember seeing the numbers from another guy that had a similar setup I quoted )... I was limited to ~350rwhp on the stock heads so I wasn't going to bother until I could get my heads ported again. Sold the car off before I got that far due to little issues I got sick of dealing with. Optispark for the loss...
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)... I was limited to ~350rwhp on the stock heads so I wasn't going to bother until I could get my heads ported again. Sold the car off before I got that far due to little issues I got sick of dealing with. Optispark for the loss... 
