That would be for strictly home theater and not for critical music listening.I have seen Mike P. suggesting a 125hz resonance will be fine with a 4th order @ 80Hz.
The box is 5 cubic feet net, 10 cubic feet gross
Your port displaces 2.2. cu.ft., that leaves 2.8 cu.ft. for bracing which is excessive.
Lowering the port height to 2.75" will raise the FPR. and shorten the port length.