Hey steve,
Not much out there on the market in the way of schocks and springs for a KE70. Your best bet is to convert to AE86 struts and then speak to one of the site sponsors on here about some shocks and springs for those.
In regards to your corona LCA's they will bolt up to KE70 struts and will still bolt up to ae86 struts if you go down that path in the future. just replace them with your current ones then all you'll need is a wheel alignment and you're laughing.
Have a read of the front suspension thread in the tech article section. should have some handy info there (y)
Cheers, Calvin