there are some pictures with the mk4 turbo motor on the z32. i just cant remember where it was. and in regard to lag..prolly just depends on your turbo setup. And I think the the Mk4 (2jzgte something i think) turbo motor was rated to produce better power on stock internals compared to the rb26dett motor.
That rb26det conversion looks real sick. Just hope you can handle the power because there has been cases of 240sx's crashing with that motor and just wondering how the z32 will react. good luck