Switching from foot brake 727 to power glide with brake

Looking for suggestions. I’m thinking about putting a power glide in my car that has a trans brake and pulling the foot brake 727 out. I currently run a 1.56 60 ft leaving at 3500 off the foot brake and I realize the power glide has a 1.76 gear but if l leave off the brake at 4600 or so rpm should I expect the 60 ft to still slow down? Running a 270/280 620/625 roller cam in a 3000 lbs race weight car. Any help or suggestions is appreciated thanks!