That is exactly right. Take car of the drivetrain, and it will take care of you. I have a .63 hotside on my 35R. I like it. It still pulls HARD up top. I did 485 on pump tuned by Junior. He will be coming down alot for tunes at my shop. You will benefit from the 3-4 gear since they are longer in the VIII then the IX. Luckyyy
You will EASILY hit 500's on pump. Shit Im stock block and a 35R. If you dont, Come get a tune with us. PM'd by the way.