Budget power plan for your Rocco:

get a 3A block out of an Audi 80/90, or get a full ABA engine from a 93-98 2.slow (preferably the ABA due to the cross-flow head design)

run a megasquirt ecu w/ a digi1 (corrado g60) wiring harness/fuel system

find a cheap turbo (older saab 900's, volvo 240/740/940's all used Garrett T3's)

double stack headgaskets to lower compression

upgrade FPR and injectors when need be depending on boost

replace the rivets that hold your diff w/ a HD bolt kit, or take a jackhammer directly to the tranny to speed up the impending doom that would otherwise happen