Not Ranked
mtrain2000:
My summarization of the above comments: The 428 has a bit more grunt at low RPM and at higher revs will run out of breath before the 427. So, the 428 is probably a bit better for street and autocross, with the 427 better for high RPM track use.
As others have pointed out the differences aren't significant, so unless you're planning to spend a lot of time at the track I'd stay with the 428, especially as it sounds like it's well built, well sorted and jolly good fun as is. Save your money and spend it elsewhere - like that '67 Mustang!
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