Ok, long tubes would definatly be a good investment. You can also think about upgrading to 24lb injectors. If you do, make sure you get a MAF that is calibrated to it. You can also get a bigger MAF. You can kill two birds with one stone.
If you do the injector upgrade, you might want to get an adjustable fuel regulator. You can increase the PSI for the new injectors. You can get an aluminum drive shaft. It won't increase your HP, but it will help you in the high end. You can also get some traction drvices, such as lower control arms, traction bars, drag shocks/struts. Make sure you get some chasis stiffing stuff while your building your pony. Sub frame connectors are a good thing to get. Hope this gives you some ideas.