Texas - The serial number from your block decodes as a 1955.2 Series Regular production 235 installed in a 3600. Block and cylinder head casting numbers and dates confirm them both as 1955.2 Series 235 with the low mount large water pump casting hole in the front of the block.
The regular production truck 235's were solid lifter equipped engines from the factory.
You can read the full description of how the oil is circulated up to the rocker arm assembly on this
page of the 1955.2 Shop Manual.
