The 0411 will drive differently, but you'll learn to love it. You should be sure to install a tow/haul shifter and wire it in when you do. From what I've read 01-02 astro vans had tow shifters that you do not have to modify to fit our trucks. The fuel cutout when coasting will surprise you at first with the 0411, but its not a bad gig. Other than that I was fine with how the 411 with the bosch yellow tops when I swapped everything. If you have access to HP tuners or EFI live, do yourself a favor and bump your idle speed up to 700rpm minimum and add 25 and 50 rpm for a smoother idle.
Someone put that console in from a suburban. I don't think it was even an option till '99 or so. But hey, I put one in my truck and I love it.
Since this is your tow pig, look into remaking your oil cooler lines. They're aluminum and when they start to leak they will never stop. Some people on FSC have reported them bursting (I guess like every other hose on a vehicle) but it wouldn't be a bad idea to change them out for something better.