Most of the parts for the 1.9 fit the SPI I can even get 1.9 cams from comp cams.They have the same lift etc just the ports/valves are larger on the SPI. And the rods/bore on the Zetec is the same as the SPI so you can get Zetec rods/pistons and up the compression to 9.6:1 instead of 9.2:1 or go with some aftermarket stuffs from like esslinger or something of the like. I have lots of options, I just haven't had alot of time to do engine stuff with school starting soon gotta work out the financial aid etc thing *sighs*