Check the classified section or post a WTB for a set of V8 towers, you should be able to find a set fairly cheap.
The V8 towers sit further forward, and are lower than the I6 towers, which would be necessary to maintain proper driveline angle. As you've probably noticed, the V8 on I6 mounts tilts rearward due to the wrong mount height, as you can see in the pic of my truck mounted that way
