OK, lets make this easy.
You stated the VIN prefixes CE, that tells us its a Cheverolet conventional with a V8 engine. This is shown in the VIN decoders linked and thousands of other places.
You provided a SPID that does not indicate an engine or transmission option.
As such the truck was built in a base or default configuration.
For a 70 C/10, 1/2 ton truck the base V8 was a 307 2bbl engine. The base transmission was a column shift manual three speed.
If you were to look at the powertrain charts linked (
http://67-72chevytrucks.com/vboard/s...7&postcount=10 ), you will see that a 70 C/10 with a 307 and a three speed manual transmission was assembled with a 3.73:1 rear end ratio.
3.07 and 4.11 as well as positraction were all optional. However your SPID again does not indicate that any of these powertrain options were selected.
Now the important thing to remember here is this is how the truck was built in 1969/70. What you have now is up to you to determine.