https://www.allports.nz/product-group/48361-malpassi-fuel-filter-regulator-for-carburetor-engines/product
Looking at doing 40dcoes on my BMW2002 and getting one of these to be sure of correct fuel pressure just to be sure, however I used to have a starlet running a 5k and a 28/36 Weber and the standard mechanical pump was fine without a regulator, the mechanical pumps run low pressure