What should my next modifications be?

[cleanLX]

You absolutly sure it's speed density? I read elswhere that someone "told" you it was speed density...? Why not verify that one for sure!
In answer to your question, with heads, cam, intake and exhaust, you may want to uncork that puppy with...
65mm throttle body.
7xmm mass air calibrated for 24lbs injectors.
24lbs injectors.
And then keeping it from twisting into a pretzel with...
sub frame connectors.
torque box reinforcment (south side lowers!)
strut tower brace.
Just some thoughts.

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'92 emerald coupe, no air silencer, bored stock MAF to 60mm, sub-frames welded, strut tower brace, 180 thermo, 16 deg's, K'n'N panel, bosh platniums, u.d. pullies, off road h-pipe, hurst "stir stick", fms 3.73's. otherwise, factory original.
best 1/4 = 13.264@ 100.89mph with a 1.824 60 ft. on turbines with 235/60-R15 BFG DR's