Clamps and rubber fuel-hose connections work fine. Or, if you are not concerned about appearing "authentic", you could put any type of filter before the fuel pump and use a stop-cock on the fuel-tank side of the filter.
I did this with dual carbs on a 261 in a situation where there was no place to put the filter between the fuel pump and the carbs. By placing the fuel pump before the fuel pump amnd having a stop cock between the pump and the fuel tank, (1) you can stop the flow when you want to clean/replace the fuel filter, and (2) use a glass bowl filter that will drip on the ground when you service it.
Here is the arrangement of parts (my original-size fuel lines are 5/16" and all connections are metal Weatherhead-Eaton from NAPA):
fuel line from tank -> brass stop cock -> filter -> fuel pump -> line to carbs
fuel line from tank into 5/16" compression fitting on the stopcock; 1/8" threaded male out of stopcock into 1/8" female into glass bowl-filter; 1/8" threaded male to 5/16" compression adapter out of the fuel pump (this adapter goes into the 1/8" threaded female on output side of filter and has a 5/16" compression fitting to go onto the fuel line going to the carburetor).
