Theres not much you can modify on the V6's. Your pretty much stuck with the intake manifold, which only leaves you with two barrel carbs. You can probably put headers on it, but watch the RPM's on the v6's. its easy to throw a rod through the block. The 305 has a max of 3800 RPM, so the 351 cant be much more than that. Trying a different gearing would probably be a safer bet.
