measure carefully, because some cutting is definitely going to be necessary. Here's a willwood set in a GL beetle my buddy is working on. Notice the space needed for master cylinders, and the dotted lines on the tunnel where "foot clearance" is likely to be needed.
Now, you can probably get some of the space back by using a pedal set that puts the master cylinders under your heels (which is how my next car is done), but they tend to be a little more money than the style shown above. Unfortunately I don't have any photos of the modifications they made to the make the above pedal set work. Trans tunnel was trimmed, and the front bulkhead was modified on both the pan and body.
-Dave