upfucd

so, i have the option to buy a Tii engine and tranny for 650$ or a 3rd gen engine and tranny for 1600$ from osakajdmmotors.com.

what i want to know is, what exactly is the difference between these two besides the twin turbos? is there anything really that much different with in internals between the two?
i'm gonna have which ever one i get rebuilt and as big a single turbo as i can find installed and ported to all hell when i get it anyways. do you think i could still get as much power out of the Tii as i could with the newer one?

thanks.