DFI and Multi point EFI have a profound effect on engine width measurement. Between SPFI and MPFI my engines width went down from 438cm to 57cm. I may be going out on a limb suggesting that this is an unintentional effect, but it sure seems that way to me. DFI is also affected and has much the same effect as MPFI.
Actually, I think a 4 meter wide engine is kind of strange to begin with, but all the carburettors result in 4m width and MPFI and DFI are the odd ones out.
Tried these on medium block, but I think small had same problem.