43's are WAY too cold for normal street use - they'll foul regularly. 44's are a little better, but the 45 heat range is trouble-free. I run R45S plugs in all my vintage small-blocks, and have for years. My '69 Z/28 runs stock carbon-core wires, stock coil, and Accel #110128 28-32 oz. points, with zero issues. Stock points are 19-23 oz., and break up over 6000 rpm.