350-400hp budget build 360 ideas???

i recently purchased a 71' 360 with 727 trans that's never been apart and only had 60,000 original miles. this is the factory 2-bbl engine rated at 255hp as is. this motor has the 1.88 J heads. what are some economical ways to get about 350hp-400hp from this setup? i was thinking 2.02 valves, higher compression pistons, cam etc... i'd like to spend under $2,000. i have acquired an edelbrock performer rpm air-gap intake manifold and i also have a 600cfm thermoquad. this is going in a street driven duster with 3.91 gears. i'm 20 years onld and this is my first engine build so any and all advice is greatly appreciated! thanks again everybody!!!