you'll probably need to 'massage' the strut tower a little, depending on the air cleaners and manifold you end up using, but they certainly do fit, and they're not overkill for a half decent 5k...
plus they sound awesome...
this may be a silly question... but... has anyone tried using the 12R flat tops in a 5K?
they're the same bore, close on the pin height, and a 2mm larger diameter pin... being from a similar era motor, there's a very tiny possibility of getting away with another Toyota factory rod and some creative crank grinding...