Yes you can do an npi to pi head and intake swap. Its been done many times for many years. Also you can not just build a 1000hp motor and slap it in. You need to build the rest of the car too. Any plans for that aspect? As far as daily driving a 1000hp car, you will be perpetually broke and NOT driving every day. Not trying to burst your bubble but your goal of 1000hp for $6500 isnt going to happen. Try a more realistic goal. Ive got roughly $4000 into my car without paint, interior work and Im pulling the engine very soon.
The Texas Green Bird (An undeveloped work of art.)
92 Thunderbird Sport 5.0: Sold
91 gt, 5.0 73mm turbo, 5spd, 373s, and much more