I have purchased an S-Tec System 50 with electric trim for my 64 Aztec. It was removed from a 64 Aztec with a ser. number very close to mine. I have also purchased the STC package from an S-Tec dealer for $2000. I have talked to the big Avionics shops in my area and they have giving me ridiculous quotes. I am in Massachusetts. The shop I purchased ...