Many early engines didn't even have an oil filter, some just had a screen to catch big chunks.
When they did move to filtering the oil, most had a filter cartridge/cannister system. When "spin-on" filters got to be popular, adapters were marketed to convert most of the common block types. I had a '57 Ford Y-block that had been converted, it was a lot less messy than the cartridge/cannister type.
The oil filter cast on your motor is a little crude but visually "okay", most spin-on filters for the time period you are portraying had fairly straight sides with a slightly convex bottom. I doubt any contest judge would ding you if you painted it the proper color and put the correct brand for that color. How exactingly correct is up to you.
A google image search should give you some examples if you search for chevy engines of the displacement you are duplicating.
There are a couple decent looking quadrajet carbs that can be used for this but I don't know what kit at this time. A Carter or Edelbrock carb will give a closer representation than a Holley will but that is up to you.