That’s exactly how that 396bbc felt with the sp2p on it.
After about 3000-3500 rpm, pushing on the gas pedal felt like pushing on the brakes.

As with most things........ if you do some digging around on the net you can find people relaying their sp2p experiences, you’ll find some good and some bad.
Most I saw were negative....... but there were a few who had favorable things to say.

One I saw that stood out(probably because it had a pro and a con) was....... the car picked up 2mpg........ but was gutless.