i just thought i'd throw my two cents in here, yes the f23 has huge potential, now i know its not necessarily a full-motor build, but its similar.
right now i have a fully custom turbo kit with the precision sc32 turbo and tial BOV and WG, with aem ems and walbro pump, making 250 to the wheel on pump gas with a conservative tune because i blew the last motor.
now to the point, right now im building my motor, with darton replacement sleeves, JE pistons +1/2 size over stock, Crower rods, Ferrea valves, valve springs and retainers, ARP studs, etc. etc. its being assembled here within the next two weeks and should be in the car this month i believe.
the goal is 400 whp, about depending on how hard we wanna push it, i cant really go much higher b/c the turbo maxes out at 480 and i ran outta money so i can't upgrade the turbo anytime soon hahaha
so the f23 can be run safely, and with high numbers, if it is tuned right and done right. it has so much potential!