margalla can actually pull nicer even with ac, if it is tuned correct, that is the real issue
Ofcourse i never suggest a carby engine for swap in this era, it is just plain inefficient. A g16 will be cheap and practical, it will be less costly than g10 and will have better power and fuel average than any g13 variant.
I usually am against any swap other than G series, because it involves more alteration and more things for mechanics to do wrong.
Most people do not have the skills to handle such technicality.....