[DJPlaster58]

I looked at both and what sold me on a Backdraft over the SP was the handling and performance. If you want something that duplicates the original and has better fit and finish then go with SP. The true tipping point for me was the difference in dealers for each product. The SP dealer had no show room and was storing the cars in an unheated barn. I ask him to arrange for a ride in one and he didn't get back to me for two months by that time I bought my BDR from Vintage. Brian and Jay are great to deal with and very responsive when and if issues come up. In my opinion the guys to go to for a BDR know the car inside and out with great customer service.
As far as power goes I have an old school carbs/solid lifter 427W 600 hp at flywheel and it is more than enough. The car handles the power very well and is very predictable under power. If I had to do it over again I would probably go with Coyote engine which still is plenty of power but more drivable in traffic in the area I live in. Good luck in your quest.