Turbo suspension advice

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Hi,

I am wanting to upgrade the suspension in my 98 Corolla VE as it under-steers like crazy, plows and sucks. I have factory sway bars, KYB GR2 shocks and stock springs.

I read online that for 98 Toyota went to a all aluminum motor that was lighter than the 96-97 year Corolla. I have searched and reviewed the suspension threads and they are great for showing all the options but I have a few questions?

Tokico lists the HP from 93-01 as the same shock part number so the shock valving was no stiffer for the lighter weight new motor?

Since I have the 3SGTE swap with a front mount intercooler and my motor is cast iron cylinder block I think the older spec 93-97 car suspension that had the older heavier motor would work much better than my 98 spec suspension I have now?

From searching the 1ZZ-FE engine weighs 225 lbs? and my 3SGTE engine and tranny is about 350 lbs. i don't know how heavy the stock Corolla 5spd tranny is 80 lbs.? totaling around 300 lbs.? and how heavy is the 1.8 liter 7A-FE engine?

I have tried comparing springs rates as I assume the 98-01 spec springs were lighter kg than 93-97 but does anybody actually know? Theoretically I would like to retro fit the older suspension in the car as I think it's better rated for my extra front end weight.
I have KW V3 for my Supra TT but that is to much money and over kill for my Corolla, I just want springs and shocks with a light drop and nice ride quality. Does any one know if the older spec springs fit my upper shock mounts etc.

Thanks,
Mark