I went with Hedman Elites on my 289 (same). They slid right in from under the car after engine install with no problem. Great fit. They sit low so you'll lose some ground clearance. (I've got about 3 1/2-4 inches) I've been told they look wicked from someone in front of you looking in their rearview. Nickel coated and they ran about $265 if I'm not mistaken from Jegs. BTW, my car was original I6 also.