I have a template I can email you. What booster and pedal did you get.  Every aftermarket pedal I ship has to be modified before I sell it or they won't fit properly.

Rats... I should have made Dennis answer that one !! 

The pictures I sent you show the hole and the requirements to get the pedal to actually fit.  Right out of the wrapper, it is not going to fit even if you had the holes due to the top of the pedal being too long.  Another thing to check is to be sure the foot pad support plate top edge is parallel to the pivot tube at the top.  They rarely are, and if you just bolt it in, the foot pad will sit tilted to one side or the other.

When you buy parts from MustangSteve, all the stuff like that is already corrected before the parts are shipped out.  Top of pedal is trimmed. Bushings are fitted properly, and the foot pad contact plate is corrected so everything fits like it should when the customer installs it.  But, at least you will have something to do the day you install all of it !

Be sure you trim the firewall per the template on my FAQ page BOOSTERS AND BRAKE PEDALS before you try to bolt up the booster or the too-small firewall hole will bind on the booster piston and make it not work right.  Hopefully you got a template with the booster.

When I did the conversion on my 68 I used a power brake pedal from a 69 car that had power brakes. My bracket had the hole at the top already drilled even though it was a manual brake 6 cyl car. Make sure you get the proper brake light switch for a power brake car. The manual brake switch won't work properly if you try to use it with power brakes.

You cannot tell which switch you have unless you have BOTH of them side-by-side.  They are identical except for the spring pressure.

I finally found the lost templates !!!!