Hi Effvee!
Rainer Orminski (typ4shop.de)has an 1302 with a 3Ltr(105X86) Type 4.This is the buildup of his racecar:
http://www.kaefermotor.de/Forum/viewtopic.php?f=7&t=174
Best is if you use Google Chrome and translate it.
Rainer also produces his own type1-style type4 heads:
http://www.kaefermotor.de/Forum/view...php?f=11&t=186
What exactly are you looking for?