The reverse cast 105 means it's a 73 and later truck block. They often have the extra webbing around the mains, and can Rarely be bored .080 over to 428 bore (sonic check everything of course).
Most casting numbers won't tell you squat about what CID you have. You need to do the dowel test.
Remove the spark plugs for the #1 and 4 cylinders. Insert a wooden dowel in #1 and bring it up to TDC by manually turning the crank nut. Make a mark on the dowel at this point. Now put the dowel in #4 (which will be at the bottom of it's stroke) and make a mark. The measured difference between the two marks is your stroke.
3.5"=352/360
about 3 3/4"(3.784)=390
about 4"(3.984)=410/428

If you get 3.5" or 4" then the only way to tell which of the two cid it could be is to pull a head and measure the bore.
4"=352
4.05"=360/390/410
4.13"=428

I left out the 406 and 427 because they are super rare and I very much doubt someone would put one in a truck.

One casting that will at least tell you the date of the block is the small date casting between the filter pad and oil pan on the bottom side of the block.