FYI, when people refer to Cleveland 2V and 4V, the V means venturi, not valve. All 351 heads are 2 valve heads. Venturi refers to the carb. 2V means 2 barrel and 4V means 4 barrel. The ports and combustion chambers are different between the 2V and 4V heads. Clevelands are great motors, but are difficult to find for less than an arm and a leg. It'd probably be cheaper to run a Windsor block.
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