Mass Air, TB, EGR Spacer??

You won't pick up much by going larger now, wait till you want to upgrade the heads and intake.

Then go larger inj 24#-30#, 70mm TB and a 80mm Pro-M MAF

The stock parts are as follows:

MAF - 55mm / 19lb calibration
TB - 58mm on 1987-1988 / 60mm on 1989-1993
EGR - matches the TB

One of the easiest upgrades is to replace the restrictive MAF with a 70mm or larger unit. This change corrects a bottle neck in the upper RPM range of the motor. The swap usually takes 10 minutes or less (assuming you get one calibrated for 19lb injectors)

Popular Brands are:
Professional Mass Air (formally Pro-M)
C&L (very common)

The 19lb injectors are good up to 300HP or so.

If you stay N/A you will be fine with a 65mm TB / EGR.

There are a lot of good brands for TB/EGR's.

accufab for TB, and pro-m or C&L for mass air.