[Barnsnake]

If you want "significantly" more power without a major loss of drivability, you need more displacement. You could stroke the 302, or move to a stroked 351. The latter option would require new (or significantly modified) headers. There's certainly more power potential in a 392, 408, or 427 Windsor than any 302-based motor. The torque increase also helps the drivability.
Pushing the 302 to anywhere near those power levels would likely make it unpleasant to drive anywhere but a racetrack.