before you go spending anything. I'd suggest getting your automotive skills up a bit. The engine swap is quite easy if you have an engine hoist and a buddy. Also, get the right installation gear. Mounts/driveshaft. If you have no experience with wiring send it out to be done. After those issue are handled. Keep a handy automotive tech that knows cars around. Most times even the forum can not lead in the right direction due to lack of input on the owners side. If this is your first swap ever it might take more time than you think. Also consider if your chasis needs attention due to rust or poor metal qualities. If you look around at most of these guys chasis. They have been through a restore of some sort and a good general amount of them aren't new to z cars. Don't buy that car untill you have a body shop check it out. It may look solid but ask around. That car could just be a junker with you spending another 3-5000 in body work. Also, keep in mind this is not a cheap swap! I myself have an s13 chasis with an rb25det swap. It wasn't inexpensive but it was alot easier with mckinney hardware.
also, i know it's a front clip. Motorset is simply the way to go. keep in mind the shipping cost.