What should i do next.....

Hey guys, i havnt owned a mustang for a year.....i sold my 00 stg 2 roush vert about a year ago due to financial problems.....i found this car for sale and im thinking about buying it. im just wondering what should i do next for more power and what kind of power should i be expecting from the current setup. i also would like to know if theres something i should look out for before i purchase the car. my knowledge of 5.0 mustangs is very limited. here is a list of current modifications that will affect performance.

Motor & Tranny:
Windsor Jr heads with cleaned chambers and port match to intake
GT40 intake (port matched to heads)
65mm TB
24 lb. injectors
Pro-M Bullet MAF
E-303 Cam
Harland Sharp 1.6 roller rockers
Underdrive pullies
FRPP Shorty headers
Bassani cat x-pipe
Dynomax 2-1/2" cat back
130 amp 3G alternator
T5-Z Transmission
Pro 5.0 shifter w/Tri-Ax handle and leather knob and boot
SPEC Stage 2 clutch
Forte's firewall adjuster
3.27:1 rear gears
FRPP Blue hose set
SCT Custom Chip by Apten

Suspension and Brakes:
SN95 5-lug Conversion
Cobra 13" front brakes
SN95 rear disc brakes
'93 Cobra brake booster and master cylinder!!
Adjustable prop valve
'99 Cobra Wheels
Bridgestone RE730 245/45-17's
Max Motorsports subframe connectors
Max Motorsports strut brace
Max Motorsports k-member brace
Max Motorsports rear lower control arms
Torque boxes welded by Sheldon @ Big Boy
H&R Race springs front
Eibach Prokit springs rear
Bilstein HD struts and shocks
GW caster plates

any opinions greatly appreciated!

o yea, i forgot to say it is a 1990 mustang gt

i plan on driving it everyday
so i don't need tremendous power
i was thinking either blower or turbo
should i put in a tremec tranny before i go for either setup?
n e reccomendations on blower or turbo?

thanks for the input!