JLCustomizing

Recently I had some problems with my car hesitating and bogging down, also not accelerating past 45. I found out the previous owner put the fuel filter on backwards and it fixed the problem for about 2 months but recently the car is having a hard time getting from 15-35 and 45-50, it feels like its struggling. I put a fram visible fuel filter on there and am wondering if maybe its to small? I believe it was a G2 fuel filter. The car has a modified 350 in it.