Not sure what the 87's had as a carb set-up , but I'm sure it is still lean.....put in at least on size larger main jet , possibly 2 sizes . Yes the air cleaner box / lid / element has too be there for OEM or stock bike too tune properly . New plug perhap's ( use the OEM recommended type and heat range of plug ). You may be light years ahead on the tank to buy an aftermarket plastic one instead of messing around with the old rusty one ( unless of course you are a pro at cleaning them up .) .