But, look what you have given up in terms of street-friendly driveability with the rear end gears (not freeway friendly,) raised stall speed (a turbo motor can use a stock torque converter, unless you need every tenth) to accommodate the charcterisics of the long-duration cam, and with the addition of the 4.88's it can only get worse. Quicker, to be sure, but unless you provide an overdrive, freeway driving will become a thing of the past. For some weird reason, the turbo motors seem to work best with axle ratios in the 2's.... 2.76, etc... The short duration cams they also like, idle pretty much like a stock cam, so there is no loss of low end torque, so there's no necessity for a looser converter. $$$ saved...
On the other hand....
You have done an excellent job with your Dart in getting the e.t.'s and speeds out of it to this date, but I think the (relatively) cheap and easy stuff has pretty much been exploited to the fullest, and further improvements in performance are still very much do-able, but will come at a higher price, now. Just my opinion...
Congratulations on a job well-done. I'd say that low 14's out of a street-driven /6 powered Dart like yours is really a worthwhile accomplishment!
I'll bet it's a FUN RIDE!!!!:cheers:
Bill