I'm not sure because it came on my brothers 460 I think it's a 600 (not positive) with the vac secondaries.In the vid that I posted the other day at the end of 2nd you can hear it busting up

 

I've got the wiring harness and computer off an 89 vert still have the maf, sensors. I believe I have just about everything it's just gonna be awhile if I even do it

 

Its a carb off a 460? Is it a stock carb off a 460? If so, Id condemn that bitch in a hurry

 

if your carb has been running excessively rich then by now the plugs may be fouled which may account for the hesitation you now have,...you really should buy a carberator book and learn the theroy and operation, carbs are not that difficult and tuned right work well....but you need a good carb to start with not a used old worn out one that may have more issues than you know

 

the 650 had 64 size jets and the other carb had 66 jets I think if that helps any