A sure fire way to tell 302 vs 351W is the width of the intake. The 351 is something like 10 inches and the 302 is going to be around 8?? I can't remember exactly. There are also reinforcing ribs on the 351 intake and around the distributor mount as it is taller, the 302 is almost flush. On a car it's easy to tell because of the location of the thermostat bolts.
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