carb change

what to try my buddies carb from some of you guys replies that i may be over carb. and want to ask if you thought this carb would work out or not...its a( older BG 750) that has some work done to it. right now i have the hp 950 on my car.... heres the specs of the motor..
30" 340 ( bout 11.1)
head flow 240/140@500
com cam xs282s solid cam 520/540 with 1.5 roller rockers
36 degrees locked out dist. with auto lite 63 gap at 40 msd6al
x-cal intake port matched 1" spacer with hp950 82fr 4.5pv/88bk no pv
stock stroke / milodon deep pan
727 rev patt. 9.5 verta 5000
8 3/4 4.57 gears
27/10.5 qtp and 8 gal fuel cell
90/10 shocks fr/mp long drag shocks back
02/03 ss springs no clamps on back frame conn.
1970 duster
1.67 60' 7.54 et 89. mph