Thanks for the advice everyone, both in regards to selling on eBay and with dealing with the landlord's son. eBay is a last resort for me, since I am worried about scams and such.
N/A FC: I will need the N/A FC for about a week in spring since my MS3 needs bodywork, but once that is done, I will try to sell it again. I did put ads CL, RX7Club, and GRM/Racing Junk in Nov. but I think my timing was bad, with winter approaching and all. Mazdax605, I will contact you via PM about your offer.
Turbo FC: It stays unless I am told otherwise verbally AND in written form by the landlord, NOT his son. The landlord and landlady are nice, reasonable people, and if he has a problem with me keeping the FC, I expect it will be for a legitimate reason- not on a whim like his son. We will be meeting with them later this week to discuss the house repairs and his son's behavior. The guy is 32 years old, he is acting like he is 12.
Cutlass: That car still belongs to my uncle who lives in CT. I will speak to him at some point about either towing the car back to CT or having him transfer ownership to my family so that we can sell it. He hasn't towed the car like he said he would every year since he stored it at our house 15 years ago, but we will need it gone this year because the garage will be used as a workshop to facilitate house repairs.