In my opinion its not a good option at all. Margall carbureted engine was reliable but had very less low end torque, Maraglla was notorious for dying the moment you turn the AC on. Baleno has very strong engine, works good with AC and decent milage - problem only comes when you go for CNG and Petrol at same time. Unfortunately this create many issues. A petrol Baleno engine runs perfectly...
Swift engine could be a best fit but that M13A is a gas guzzler. Beware of that.
Thanks.