The single 4 barrel is your best bet by far...They make very good power and will be the easiest to tune and maintain...Most guys like to run the vic jr single plane intake..These motors are so torquey they almost have too much bottom end for the street anyway so its worth the trade off to gain more on the top end in my opinion...Carb sizes are generally in the 750-850cfm range..

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1968 mustang..408 windsor.Vic jr heads and intake.Pro Systems 950HP holley, 1 3/4 hooker super comps,Custom CI solid roller camshaft,Probe shaft rockers, 4 speed with 4:11 detroit locker.