Small hole? Far from it. You need to have clearance for the 1-2 and 3-4 shifter rods as they go over the structural hump support. Remember, when cutting the "small hole", don't cut thru the structural support.
The 4 spd hump will somewhat center itself on the existing floor tunnel. Trace the outline of the 4 speed hump with a magic marker on the floor and cut approx. 1.5" inward from the magic marker line. Once the hole is cut, mount the trans w/shifter in place and attach the rods. Trim as necessary for rod clearance.