trying to pull ponnies with little cash

im new to this site. i no im gona to get alot of responses. but i bought a 72 duster bout a yr ago its got a 318 i was told out of a 68 truck was swapped to 727 original 7 1/4 rear end. now ive had alot of different plans for this like dropping a v10 with a 6spd or a 440. but since im short on cash i have a 318 out of a 84 ram i believe it only has 60000 miles but when i tore it apart is was nasty lookin but what im basicaly asking does any have any ideas on how to get somewhere around 400hp out it with spending as little as possible and as little machining as possible the car will b use on the street more and im hopping to put a 6spd in with mayb a 9 1/4 or a dana 44 with 4.10 or 4.11:burnout: