Help me setup my 89 Notch

[zapp109]

Well I just got a 89 Notch. Ill just copy and paste what the ad said.
COMPLETE TUBLAR FRONT SUSPENSION,
CASTER/CAMBER PLATES
STRANGE ADJUSTIABLE FRONT STRUTS
COIL OVERS
8.8 REAR 31 SPLINE AXLES WITH SPOOL 410 GEARS
AEROSPACE front DISC BRAKES
upr ADJUSTIABLE LOWER CONTROL ARMS
upr ADJUSTIABLE UPPER CONTROL ARMS
COMPETITION ENGINEERING ANTI ROLL BAR
qa1 ADJUSTIABLE REAR SHOCKS
FRAME IS TIED TOGETHER
DRIVESHAFT LOOP
REAR BATTERY HOOK UP WITH ON/OFF SWITCH
RACECRAFT REAR PRO MOD WING
MSD Digital-7 Plus Programmable Ignition
WHEELS SKINNIES UP FRONT WITH 10"WIDE ON REAR 29.5X10.5X15w

OK well ill start with the setup im putting in it. Ford engine lovers should look away, Im putting a 421 Chevy SB with 650ish HP and a turbo 350 trans, that setup in my fathers nova went 10.30@128. Now I know the mustang is a bit lighter and will probably go around 10.0 but, I think the tires may be a bit oversized for this setup. Anyone else have experience with 4.10s and a turbo 350 what size tire and what trap speed? I just dont want to have these 29.5" tires holding me back. Id rather have a 28" tire. But dont want it if im gonna run out of gear. Also anyone running a 10" rim with 28" tall tire? The car has bogart 15X10 in the rear. Any input would help.

Thanks Craig