KAD32 would be an ideal replacement, not much heaver at a guess and the same size physicially. KAD43 would be nice
if you have the space for the extra 2 cylinders in the engine bay
Are the DP290 out-drives a common ratio gearbox? Or are there different ratios? I'm guessing it's all the one ration since any DP290 drives I see for sale don't mention gear ratios?