Cam match to intake

The Schumaker headers are reported to fit well and outperform even the Magnum manifolds.
Regarding the taller axle gearing: Fine by me! These cars can be many things. Drag racing got all the glory but higher speed cruising is fun too. I'll bet with a milder cam and an optimized setup, the car will still pull strong even with those gears.
Flow master mufflers....I liked the sound for many years but did grow tired after awhile.