500 cfm would be enough carb for the 307, but I dont think the 600 would hurt anything.......as long as its not a Holley DP. A o-1850 Holley (vac secondaries), or a 1406 Edelbrock should be fine. either carb would need an adaptor to run on a stock Q jet manifold(I would use a 4 hole adaptor). You could also use an old Q jet......they are 750 cfm, but the air door on the secondaries wont let it be overcarbed. Good luck.....crazy AL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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