eddy 650 or 750

just found that my free edelbrock 1406 has a nasty throttle shaft vacuum leak so its time to get a new carb. what do you all think i should go with a 650 or 750?

my set up

69 valiant about 3100 pounds street maybe a few passes at the strip and an auto-x day or two
340
crane hydraulic roller #699611
1400-5400 rpm
@.050 adv lift lsa
int 214 276 .488 112
exh 222 284 .509

J heads with 2.02 int and 1.6 exh no porting
will switch them for mildly ported aluminum heads when i can

rpm air gap

tti step headers

2.5 inch exhaust dumped at the axle

904 with hughes 2500 rpm converter

8 3/4 with open 3.23's

id also consider a holley if any one thinks there is one that would just be perfect for my set up