the prices for converted EF varies to which b16A models is installed...
most will be running on the vtec kecik= Kabel clutch which produces less power than the egs n eks series.. but the weight of the car actually compromise on the vtec kecik performance...
mostly EF9,CRX and DA6 engine halfcut are installed since its easier to match the Dashboard and the meter panel..
most ef/ed models are prone to have rusting problems, so be prepare to spend on body works as well... plus i find the EF chasis is not as strong as Egs or Eks...
but for my personal preference EG6/ 2door hatch are a much better platform in you wanna play B Series with lots of option from exterior n engine.. more upgrade options and appreciate value among Vtec lovers too.. EF are getting rare.. body parts are scarce and expensive even though it is used item...