I recently required a family, one owner Chevy 3100 pick-up truck. If anyone can help me with the year of the truck and engine size, it would be greatly appreciated. I found the following number just above the starter on the left side of the block as you are looking at it from the front of the truck...JAC 760064. The valve cover is held in place by two bolts through the center of the cover. The vehicle identification number is H53SO36680. I think the truck is an earlier 50's model, but not sure. Thanks in advance.