this is my 82 gt and ive been reading alot online about these cars being converted to five lug wheels,can anyone tell me what the benefit of doin this will be?better choice of wheels?stronger etc?

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81 aussie ltd-351w,rpm heads,performer rpm airgap intake,10.3 com,angus 1.6 rollers ,1 5/8 long tubes,750 edelbrock,comp xe274h,c4
82 GT mustang 302w-4 speed
55 two door ranchwagon
69 xw falcon wagon