Yeah I used to build Mopars as cheap as possible - tons of stock parts and used speed parts. Only bought new parts when I couldn't find it used or it was a wear item like gaskets/hoses/bearings/etc. They still ran great and stomped a lot of "built" cars. Granted that was before the era of $300 5.3 LS motors and eBay turbos, but I know if I duplicated a couple of my old setups and added some extra nitrous and a controller it would still be somewhat competitive in local events.
If you're buying all new parts, expect it to be expensive - you're the first "sucker" in the equation!