I was told I have a boat anchor in my cat. The guy has built numerous SBF Mustangs and a few BBFs, but say's the "390 or FE series are boat anchors". He said he couldn't get the power to the wheels (traction) and after he side stepped his clutch and almost ran sideways into the other drag racer he stopped building BBFs. I asked him if he used traction bars and he said he did, but forgot to ask if he ran slicks. He advised me that the FE's are harder and more costly to build and don't like the higher rpms. I'm sure that there are ways around these issues, I just don't want to pull my 390 in exchange for a smaller block if I can get around them.