On any street car spacers are fine as long as they are hubcentric and billet and not thick.I would think that not over 1" thick would be ok,I would add stronger studs/lugs to.
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68 Mustang Coupe,5.0 EFI ,T-5 5speed,18" ADR's,275/40/ rears,225/40 fronts....yeah a start. 
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