Myself I would go 5 or 10 btdc & if it doesn't kick back when starting/ping/or idle rough(which I dont think it will) you'll be better off than the factory setting which iirc is TDC. Also keep in mind that the slot length (& possibly the springs but I think they are the same, one light one & one thick looped one) will be different between the elec & the older point dist so you could do some mixing/matching if you want to experiment to get a better curve.