Are 5 lug and suspension arm swaps legal?

[mossaidis]

I think your safest option for meeting GCR STL rules here to build yourself a 94 Civic EX/Si with ABS. It will still be 4 lug, but you will have a larger front knuckle (which BTW is the same as any non-Type R DC models), larger bearings, larger rotors/calipers (upgrade from 9.3" to 10.2") or get the Wilwood upgrade kit (11" or ~12.2") which needs the larger knuckle from the ABS model, larger brake booster and larger master cylinder. As tGA says, the Si/EX models came with disc rears, so that is an easier conversion.