Gas mileage is generally 5-9MPG better than a carb.
Throttle response is better than any intake.
More HP/TQ than 750cfm car on single plane maifold.
Fabulous under hood look.
Fully adjustable Electronic engine control.
Wayne forgot the AIR FILTERS if you should want to drive it on the road. I started with 48IDA'S and went to STACK EFI on the H/M manifold. I have now built a 3X2V or 2X4V or Blower set up for my 351W by just changing the top plate on the 360* OFFY manifold.The STACKS are Bad for the street or trips but great for SHOWS and DRAG RACING. They will give you the most H.P. in the WOW dept.
Also, Wayne didn't mention the tuning issues. It is an issue as there are some people that sold their stacks because they couldn't get them tuned properly. The type of computer you use is a significant factor in how succesful a stack installation will be.
Tuning can be difficult and time consuming especially if you are new to it like I was.
If you can afford them and have the time/patience to get them dialed in, there isn't a better option in my opinion.
I would argue with Wayne on # 2 & 3 with a well tuned carb but you can't discount the WOW factor of the stack EFI setup or the down draft Webers. I had his Stack with the old SDS computer and could not get it to work right so I sold it to Viperdude. He set it up with the Redline and apparently it works great.
I understand the Redline is a much better system than the SDS without going all out to the Electromotive setup.
I love my Holly though. Simple to tune, lots of power, easy to take care and a bit less expensive.
Nels hit the nail on the head. The control system is the key! I've heard most of the hooror stories about tuning come from the guys who used the SDS. The looks alone are worth an extra 500hp in my book!
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