what struts interchange a 97 lumina help please???

[BumpNgrind777]

Ok so i race this 97 lumina it has a 3.1 and i race bump and grind its like a motocross track for cars derby type racing lots of jumping and hiting. So i have the stock ones on it now and it also has 11in rotors not leting me put 14in wheels on it. I got told i can change the whole struts wheelbearing and rotors out of a older car with the smaller brakes and it lets 14in wheel go on. Also im wondering if i get some out of a 3800 car if they would be stiffer for the jumping. So my question is what years and models interchange???? Also do they make like a heavy duty strut???

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[BumpNgrind777]

Any Help PLEASE!!! or IDEAS