The 235 I'll be getting onto is a '58 with a '61 head. I have a '53 in my daily driver and I'm setting up for the eventuality that I'll need a change out.I'm aware of what the shop manuals offer. The book I'm referring to was on the line of a Haynes, seemed to have more photos and was in color and was offered on the same page along with the other small block books. But this was specfic to the L6. I just can't seem to retrace my Inet wanderings