The only down side (not the end of the world) i found to using standard tunnel and mine was an auto was the amount of frigging around i had to do to get the gearbox off the engine in the car was nearly more of a waste of time than just pulling engine and box out together. I used a stumpy box and had L16 stanza motor. At the least i would recommend cutting out and welding in a bigger section around the area the bellhousing is located for easy access to gearbox bolts. That said its your car and it will work as is with minor tweaks just dont expect to have much knuckles left if you need to remove the box.