v8 conversion/ springs Need Help!!

Converting a 4 banger to a 351. I'm having a had time finding springs, I'm on a tight budget so new ones are out. Just wondering if grand marquis, licoln, or thunderbird springs will work. It's an 87 lx. Will i need to change the sway bar too and how about the rear springs? All help will be greatly apprciated
 
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