I am building a Ej25 short block and I want to use EJ20 heads (dont want to buy STI heads.) I know that their is a way to modify the heads to fit onto the EJ25.  My question is, what needs to be done to the 20 heads and what would that proabably run ($) me at a shop (pdx???)? Would it just be more cost effective to buy new heads? Also will the EJ25 bolt up to a stock EJ20 Transmission (M/T)?