Very cool! I love these big cube pump gas street cars. I'm dying to put an overdrive in my 500" Duster but it's not affordable right now so I'm gonna remove the 3.55 gears from the 8.75 rearend and put some 3.23's in but 2.76's are not out of the question. With the torque of these motors, the 3.55 feels the same as a 4.30 gear in some of my previous cars. I have a tight 10" Dynamic converter, hoping it can handle a 2.76. Overdrive would be so nice.

I've never heard of the a618, what vehicle does it out of?

Got any pics of your car?