Bellhousing

Of course, if you intend on high performance usage, consider a scatter shield instead.
All good advice, especially this part. If this is a mild 318 that never sees over 5000 rpm, and normal "black & round" street tires, your feet will probably be OK.
But I second the motion that you use a scattershield for anything hotter... I'm sure lots of people will say "I never had a problem with my *** combo", but it only takes one flywheel/clutch explosion to ruin your whole day.