What mods can you do to.....
As stated either ditch the flowmaster muffler or add an electric cut out.
Porting the intake might see a slight gain. Same with adding a 58mm TB and installing an EWP. You will want to retune your car afterward. Don't touch your MAF.
Some weight reduction goes a long way.
Other than that, consider getting a larger cam (which will require more rpm to effectively make more power) or add nitrous. Both of which would warrant a stoutly built 355+ block that can take rpms and n2o...
Horsepower costs $$$
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