When swapping to a V8 using our transmission adapter kits, you'll need a 3/4" bore master cylinder to go with it. The factory 4Runner, Tacoma, Pickup, T100 etc. size is only 5/8", which wont be enough.
Fortunately, we have an OEM Toyota option that is inexpensive and bolts right in! Not a cheap knockoff, actual factory OEM part.
Depending on your chassis, there might be fitment issues with the reservoir, but that's an easier problem to fix than having the wrong size cylinder.