They don't have a PAL -> NTSC guide for ProCoder2 at videohelp. I've never used ProCoder2 for this purpose, I just never see PAL video, but you should be able to use ProCoder for this. First thing I would do would be to rip the original dvd to the hard drive using DVDDecrypter in IFO mode to get a single VOB file. This guide shows how to do this. Or you could use Vob2Mpeg to convert the files you already have on the hard drive over to a single mpeg2 file. Either can be imported into ProCoder2 and easily used.
When you start Procoder2, you'll see a page called Source. Click on Add and find your single Vob or mpeg2 file that you previously made from the PAL DVD. You'll get a small window where you choose this file, then hit Open.
Now on the left side of the page, hit Target. This will bring up a new window, called Load Preset Target. Open up the CD/DVD line, then hit DVD. You'll get a choice of presets. The one you want is MPEG2-DVD-NTSC-VOB. Hit OK. You may want to look through the options and adjust some things, such as where the converted video will be placed on your hard drive. The preset uses CBR 6000kbps. This can be adjusted if you want to use VBR or change the bitrate.
On the left side of the page, under Target you'll see Convert. Click on it now. This opens the page for the conversion process. Hit the Convert button under the preview screen and you'll be off and running. It will take several hours to convert.
Once your video is converted, you can burn to disk with any normal dvd burning program, like Nero or ImgBurn using the build mode.
By the way, doing it this way you are only getting the main movie. You'll lose the menus and extras. Keeping those when converting PAL-NTSC seems to be very hard, from the little I've read about it.