Scottydog,
There some differancies with the 280e engine.....dif.pistons higher comp.larger inl. &exh. valves.. dif.cams...even stroke crank... but it does fit by the usual changes....If you decide to make the install make sure you get BOTH computers....one for the inj. & the black one for the ign.
The early K-Jet B28E is basically identical once you swap rocker covers, timing covers and lower crank case over. In fact AFAIK the GTA Atmo and the Volvo 760 were the only two cars on sale in the UK to get the 2849 odd-fire. If it's a B280, then it's a very different engine. If you find a B28E and want to use it, you'll need to cap off the injector ports. Your original carbs and everything will otherwise bolt right up