comparing the de's, I've had cars with r33 type 25de and 25de neo at the same time, driving them back to back for a while seemed to be nothing really in it between them for power or economy
not in vic area, but when car was 300kw it made 4kw less going from a dyno dynamics to a dynapack setup on sae, also looked lazy in the mid range on the dynapack
no neos run the alloy type 33 CAS,(some late 33s had the plastic cap neo type) i have done a neo de swap because it was lying around using early ecu, ran perfectly, not saying it's ideal but does work, and not worth it unless your car is dead & you've got a free neo
if the std throttle body doesn't clear the 80mm probably won't either, have seen a few converted cars with the throttle body on sideways so the cable pulley was on the top