Always helps if you put the year, model, serial# ???? A picture helps too.
Something that old anything you add can help in finding the parts you need??
I looked up a 1984 3.5 and carb kit is NLA and the tank gasket is NLA
If Franz can't help?? Maybe I can, I have a bin of older Chrysler parts.
If you can find the CHRYSLER part number I might have it.
Send me a PM with the part #s
If I have it I usually give the parts away FREE but I do ask for a donation to an animal shelter. That covers the FREE parts and shipping.