Probably the reason you haven't seen anyone do it is because no one makes a tunnel ram for a 351 based motor....It is possible using a 302 intake and spacers..

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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.