What is the year of your 235?
There were lower pressure 235s (1941 through some 235s in 1953) and higher pressure 235s (some in 1953 and all from 54 onwards). All of them were full-pressure relative to their design.
In 1953, the 235s with hydraulic lifers (used on Powerglide equipped cars and Corvettes) were the higher pressure 235s. 1953 manual transmission cars with a 235 (I think that was an option in cars) and all 1953 trucks with a 235 were the lower pressure implementation.
GM referred to both higher and lower pressure 235s as full-pressure engines.
If your truck has an "848" head (3836848) it is a higher pressure 235.
