Good decision on the kit. Wait until she performs first.
STEEDA's kit = Xenon
Simple path.
1) gears 4.10s
2) suspension - your choice a lot of kits and providers. But are you going to go with straight line performance or will you plan on turns.
Stage 3, STEEDA has a good contained package.
For starters.
3)headers - long tube for max hp though.
4)X pipes - your choice on provider
5)mufflers - again your choice on sound preference
Note: S351s were made in Ca. You probably shouldn't sweat the emissions thing until you have enough money to do engine work.
Speaking of which ...
6)forged internals ... pistons, rods to sustain the forced iunduction beating you're planning.
7)Al drive shaft save weight on rotational mass (small mod but worth it-considering your goals)
8) choice of forced induction ... by this time you should know which kit to go with.
Vortech - Paxton; Centri kits make higher hp for strip racing.
Right now ... read up on S/Cs that are out there now. Once you've paid for 1-7 you'll have your mid made up on #8.
Making 350rwhp - - easy. Making the money to get there is the hard part. Spending is easy.