Just use Model Please's B1 "Kaless" Class Dreadnaught or a proper SFB 3 engined C8, which are on Battle Clinic.
All the standard ships, in the SFC 1 shiplist, can be replaced with the correct SFB models from various shipyards or Battle Clinic.
I run SFC 1 as well, and have all the correct SFB models to replace all the standard wrong ones that came wirth the game, even the shuttles, freighters and stations.
I've also added in the whole Kzinti fleet, Tholians, Cardasians, Dominion, Borg, etc. into the game. It's all there to be found, with a bit of effort.