For another perspective, I've run my BJ8 for 25 years and almost 100K miles with no fuel filters besides the screens in the pump and the carbs, and never had a problem with any crud in the system. I put in a new tank with Bill Hirsh slosh (probably) 15-20 years ago, and I freshen the flex line every 10 years or so. I run Grose jets, which are probably more susceptible to contamination than needle valves. I also live in California, so who knows what formulations and additives the gas has had over the years (MTBE and ethanol, for sure).
I'm not saying a filter (or two) isn't a good idea, but you CAN do just fine without them. If you have filter(s), and you're getting a lot of junk in them you should correct the problem; don't use the filter(s) to compensate for an underlying problem--if it's bad enough the filter will clog anyway.