You can get NEW injectors for $800, even the relatively new and pricey EDMs. I think $800 would get you more than that, though. Have to double check. RUN, dont walk, to another place to do business with. The "mechanic" saw you coming from a mile off, and sensed your lack of knowledge and understanding of the simplicity of the mechanical engines, and wants to use it to his advantage. That is where WE, the TDR membership come in, to steer you in the right direction that will get you the most bang for your buck.
Daniel