Chevrolet Inline Six-Cylinder power manual by Leo Santucci.... a book with a wealth of info on rebuilding..... I bought mine on e-Bay, but I've seen them listed in the various Stovebolt related vendors... Published by California Bill's Automotive handbooks, cover price $19.95
Good Luck...
Btw... My 230 cid, I/6 has got to be the easiest engine I've ever worked on...
Later...