These two books are definately the "Pinto Bibles" -
Des Hammill -
"How to Power Tune Ford SOHC 'Pinto' and Sierra Cosworth DOHC Engines For Road and Track" is readily available at bookstores online, can also try Amazon.
David Vizard - "How to Modify Ford SOHC Engines" - I believe currently out of print and difficult to find these days - pops up as a
pdf download on occasion at places like while you look for a hard copy. Amazon or Feebay are the best options to tracking down a hardcopy.
Even the earlier edition (
"How to Power Tune the Ford SOHC 4-cylender Pinto and Cosworth DOHC Engines for Road and Track") Des Hammill book pops up online occasionally
I mention the download sites for reference only and to aid the OP in identifying the titles queried - I do not promote or condone downloading books rather than purchasing hard copies