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There is issue with heating of springs, they go weak, they fail. When spring fails at speed it can end badly, so that is very big no at least in here.
Edsel base level was with six right? Those had softer springs, so one option might be to source such springs, even new ones are not costing much and custom made springs are not really so expensive, from my understanding it is not much more than 50 for pair?
But when changing springs shocks should be replaced too, well, with Edsel you probably are not needing to do that, valving in V8 version is just going to work better with softer springs as those shocks were tuned to very low amount of rebound damping, making that mushy soft ride.
Don't forget rear springs either, you have V8 rear springs, which are bit stiffer than lower spec models (usually, haven't checked Edsel specifically, but mopar and GM stuff generally), if you soften front you are getting less understeer and while good for autocross etc. on road it can be bad, so it is worth to check if six cylinder version springs could be swapped.
From my another hobby I have learned quite a bit of suspension tuning and there one change affects everything.
Good way to evaluate stiffness and oversteer/understeer is to check natural frequency of suspension, either remove shock and bounce front/rear, calculate how many bounces it does make in second or one can even calculate it without touching the car if springs (also motion ratio of suspension) and corner weights of car are known.
There is huge difference with what looks good and what works reliably.
Mid-West spring had even some calculator software for download free on their site if interested of what kind of springs would be perfect match, worth to at least ask offers as it is cheap insurance to have properly made springs compared to what would happen at 50mph when spring fails. That is at least my 2c.
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