The only way you can make that much power for your budget is with nitrous. Your engine won't last long without supporting fuel and spark. Either do the simple bolt ons (gears make a big difference relative to price), or save up for more potent power-adders.

 

For $1000 you can do some decent mods. Are you doing the work yourself or paying someone to do it for you. If you do it yourself I would open up tour exhaust and intake first. Long tube headers with high flow cats, high flow air filter for a start. You have an SS so you might not want a air lid or cat-back exhaust. For a little more you could do a cam as well. That would really waken things up a bit but might be a bit to costly right now for your budget. Paying someone else to do the mods is going to eat up money fast!