Hey there,
I have had tons of issues over the years with modified sidefeeds and about 4 years ago stopped selling them/installing them and prefer not to tune them due to them being fine...till they are not. I had a few sets fail on personal cars on 91 or e85 so its hit or miss. Some customers have good luck but I would say on average 70% end up with issues if ran for more than a couple years.
Plus atomization at low rpm is terrible.
Cleaned and modified ones seem to last even less time honestly.
I personally would recommend top feed to just about anyone as they just work, and work for the long haul.
Just my opinion.
Dave