Lee, I dont believe it discusses prep for blow through,, but Im sure Cliff is familiar, I learned alittle myself reading the book,, the apt is vacume controlled and when it doesnt work tuning is difficult on the primary side, so I removed the factory plug, tapped the hole and reassembled the carb,, while running I found the apt did not work,,I called Cliff and he informed me that I had a base plate for a turbo application,, the vacume orfice is removed so it doesn't pressurize under boost,,somebody must have swapped it on without knowing (carb company from St Pete)..he instructed me how to drill it out, so I did,, I wish I had kept it cause Im interested in turbo apps..sidenote..those bases came off the early 80's turbo trans am's
