I have not tried this kit, but much wiser, more experienced heads than me have advised me the factory setup can be made to work extremely well.
If you don't mind significant dusting, simply get your rotors a clean-up cut and install Hawk HP Plus Sport/Track dual purpose front pads. Part number HB169N.560. They are not listed for Tigers but fit our Girling calipers perfectly. Among other cars listed, they fit a Datsun 240Z. I got them in connection with my entry into autocrossing this year and could not be more pleased. Along with my rear brake shoe upgrade, I think my brakes are amazing.
I also upgraded my rear brake shoes to vintage racing linings by Porterfield. With any brake system like ours, keeping the rear shoes properly adjusted is very key. If your e-brake lever comes up more than 4 clicks or so, the rears probably need adjusting. (Make sure no cable slack has developed in the e-brake before counting!)
If you really want Wilwood calipers, front and/or back, also check out what is available from Dales Restorations. Frankly, for street and autocrossing, you really don't need them, IMHO. I say give the pad and shoe upgrade a try before spending much more on a Wilwood upgrade.
Cheers,
Gene