1988 5 speed

Just bought this thing $500. (Also runs quite well and local import mechanic checked it all out)

When it warms up outside im gonna sand it down and buy a spoiler and get it painted. Ive been trying to find some stuff for this thing but its crazily hard. Anyone know were i can find stuff.
and im gonna buy some rims but for now im gonna sandblast the Tires until i got the money.

If possible im looking to find stuff to get it allot faster. Im newer to car customization. Ive been looking for a Cold Air Intake but cant find one anywere for older than 90's

Any ideas for stuff to do?