Using the amp is no problem. Using 2 amps is no problem. Just use your phone jack off of the Ipod and plug it into the RCA jacks. If you are using two amps, you will need to split the RCA pair into a total of 4.
The only way to control the volume would be on the Ipod itself. The two amps would be going at the same volume unless you could find some type of fader controller. I don't know if they make that sort of thing or not.
1994 205, LT1