I am doing a hemi swap into my 79 aspen and we finally got it to fit! But now im reading that the factory computer I have can't be flashed. Is this true? Hotwire says the best thing to use would be out of a 2005 dodge ram but my hemiband computer oddly enough came out of a 2007 chrysler aspen (which is still sitting in my yard). My question is can I use this computer?

I can not honestly answer this about your 2007 aspen computer,

The 05 Ram Computer is the easiest to tune of the pre canbus stuff.
I would try HP tuners or call diablo and ask them about your Aspen computer.