JBA stainless headers hands down.
http://www.jbaheaders.com/index.asp
Not cheap but they work and last. And bolt up to stock y-pipe. I mean bolt on. No tweaks, no cutting down this to fit that…
Last set of JBAs I bought, I ran for 8 years! Try that with a cheap set.
Keep your eyes peeled for a used set.
Mine didn't warp after 8 yrs and after a quick sand & polish they looked pretty much new again.
With an '88, you should be TBI and you'll need O2 for the EFI to function proper.