Just throw away the valves and tig the holes shut and you will gain low end torque, even if you don't tig the holes shut. there is a guy on the wire that sells non butterfly lower intakes do a search he lives in quartzite AZ and when i offered to make replacement lower intakes he posted up that he already makes them.

1999 Montero SAS'd on Kings and stuff

1998 Montero trying to get a V8 Swapped