Your displacement is 2.825 liters. Stroke is determined by the crank not the rods.

I would probably just do the 264/256 vac cams. Anything more than that and your probably going to have to put better springs in it and possibly shim the vanos travel. Being small displacement and limited to 7200 rpms I dont think you would see much benefit to anything bigger than that except at 6000+ rpms