note - I haven't done the S/C upgrade yet, so this is not coming from someone who really knows what they are talking about.
I am planning on and budgeting for it though. This is my DD, so maybe I am being a little paranoid, but this is what I am going to do (my rig has 105,000 miles on it - all but about 3 of them put on by me).
1.) compression test - car runs great, but just want to make sure it is as good as it seems before I put extra stress on it.
2.) New radiator + trans cooler (done)
3.) Fuel mods (not 100% sure I will do this, since I live at 4500 feet, but I am hoping I can buy a used S/C that comes with a seventh injector or something).
4.) Trans valve body upgrade - I won't do the S/C without having this done first.
By all means - those who have already done this, feel free to poke holes in this plan - maybe you'll save both me and the OP some $$.