You can swap to the 360 intake, throttle body, injectors, & computer, and they'll never know.
duh, thought I read 1989, not '84.
forget it, nothing you can do legally except gearing short of doing a lot of expensive or stealth modifications. If I were making a new build, I'd increase the stock compression with pistons and/or thinner head gaskets, a cam that a grinder recommends to help be within emissions specs, advance the timing a little, head work/valve and bowl grinding, larger exhaust pipes. That would cost a lot of $$ and get only mild gains.
If it has Lean Burn, I would look for a salvage yard hood or radiator support (whichever one has the emissions sticker/diagram) for one that has the traditional ignition and make the switch.