Your engine is an L134 in your M38, then the M38A1 had a F 134 engine. The difference is that the L head is a flat head configuration, with the spark plugs going centered vertical in relation to the head. The F head is configured with the intake valves over the head, under a valve cover. The spark plugs are angled into the side of the head. Both use the same military ignition sets and charging equipment.

Kaiser Willys will send you out a free catalog. I'll look to see if I can dig up the original posts used in compilation of the article.