289/302/351W are all very similar. You can get probably almost the same hp numbers out of all of them. On the dyno 289/302 would probably be almost identical with the same heads/cam etc. When the 302 came out in 68, it had little or no power advantage over the 289. The 351W does have a displacement advantage that adds some torque and lets you get the same or more power at lower RPM's.
Displacemet makes a difference, but just because I have a 351W it does not mean that I will beat every 289 stang that I see.
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67 Fastback - Arctic White Pearl paint
351W 415 hp, Trick Flow Alum. Heads, C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.
