Am pretty sure that 740 will be heavier springs than 735; so long as they are both from iL bodies. The weight distribution of the 740 is different to 735, the engine being a bit lighter, the trans much heavier and the rear of the 740 heavier by a maybe 25kg, so I am pretty sure 740 rears would have much higher rates and make the car a little higher than normal too. Of course old rears seem to sag, so maybe all that will just work out perfectly height wise. The front springs would certainly be very different, but if using the touring for carrying things, the springs will need a stiffer rate. I reckon from a balanced point of view 735 spring may be a much safer bet. I'd definately try those first.
Of course, you can alwasy go to a spring company and have them make something 'just right'- they simply measure the front spring rates, the car weight distribution and overall travel- do some calcs and then make the springs.
BTW: Be sure to lay something down in the rear, the carpet doesn't take much of a beating
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