The "H" decodes as a 62'-63' 194 passenger app at the chuckthetruck site I previously mentioned. It also decodes as a 57' 235 at this site, http://www.chevytrucks.org/mikesgarage/1957.htm
You need to compare your block casting no. with the list at the Inliners site given previously in this topic to further confirm your engine size and app.

Last edited by randy luton; 09/03/2010 8:38 PM. Reason: further research
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson