I heard you could use 2nd gen higher comp rotors in 13b sixport housings, correct? Also If I were to just go ahead and use the 2nd gen rotors and housings I would have to put the 6 port front and rear plates on correct? thx

 

You can't mix housings between '85-down and '86-up engines.

You can however use the '86-up rotating assembly in a '85-earlier engine.