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With the HP and weight you are at now it should be an easy 10.oh ride. Where are the numbers off? Is it spinning? Dieing on top end? Lot's of different things can cause poor ET compared to what it should go at your weight/hp. With that said, it sounds like something ain't working right. 
That's what I'm getting at. My Sons stock stroke 360 runs 10.50's to 10.70's at 3250 pounds and he's no where around 660HP. 
Yep...... 660 horse at that weight should run 9's easily. My old W5 motor probably made 650 and at 3350 pounds ran 9.80's in good sir.
Something is WAY off in that combo.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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