I think it going to be fairly tough to get that car into the 13s with a mild 302 and stock c-4..There aren't any simple bolts on that will get you there(except maybe a big shot of N2O)..If you are serious about putting a 460 in there I would put the money towards that instead of wasting it on the 302...Now if you can be happy with just improved performance out of the 302 but not necessarily 13s the typical,600cfm 4 barrel,edelbrock rpm intake,headers,mild cam and a gear change would make a big difference in what you have now.....A set of 3.70 ish gears,3500 stall convertor and shift kit in the C-4 along with some good aftermarket heads and a stroker kit in the 302 will get you probably well beyond your goal but thats not exactly a simple bolt on..

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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.