In case you didn't know, there is documentation online. The quality is okay but I prefer the books.

57 Operators Manual:
http://chevy.oldcarmanualproject.com/chevyowner/57tomindex.htm

Couldn't find 57 but 55 2nd Shop Manual may help:
http://chevy.oldcarmanualproject.com/shop/1955truck2/index.htm

55-59 Factory Assembly Manual:
https://www.trifive.com/55-59Assy.pdf

29-57 Master Parts List:
http://chevy.oldcarmanualproject.com/1929_57chevyparts/index.htm


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."