Hi, welcome to the BB.
Here's a page with lots of info about the various model years of Spiders: Spider FAQ <- link
The '80 model would have had SPICA (mechanical FI) and the '84 has Bosch (electronic FI). Unless the '80 was converted to carbs... Lots of stuff will bolt on but the FI systems are totally different.
See the link in my signature for a page about the Bosch L-jet system.
Here's a page with lots of info about the various model years of Spiders: Spider FAQ <- link
The '80 model would have had SPICA (mechanical FI) and the '84 has Bosch (electronic FI). Unless the '80 was converted to carbs... Lots of stuff will bolt on but the FI systems are totally different.
See the link in my signature for a page about the Bosch L-jet system.