Mine was a 260 i had the ears that had to be cut off and made smaller. if you use the r33 5 speed this has to be done. if you use the rb20 ( not recomended) you dont have to cut the ears.
As for throttle i used the throttle cable from the z31 i got the mounts from, and had my gas pedal modified for the cable. It conviently clipped into the hole into the firewall to:>
My writeup was done on my personal experience with my late modle 260 which is basicallly the same as the 280, so everything i did should be the same in the 280.