F series engines are very strong. can easily hold 6-8psi, if motors in good condition to start with.you can get an 'ebay' turbo kit for a starting kit for that price..
But if you buy cheap stuff its gonna cost more later when you want it bigger and better..I learned my lesson.my 1st kit i built was 1500$,not including custom DP,waste gate tube,etc.
Im just now going back and re-building a new kit..engine management alone this time was 1500$ EMS.