The Delco catalog lists the CR43TS... which is what I am running now. Just turned 135K and got some new wires, checked the plugs and they look ok, but winter is coming, at Mt Hood is ruthless in mid-winter. So I am gonna replace the plugs here soon... but I see many folks running the 45TS... probably wouldn't hurt to have a little bit hotter plug in this thing. Anyway, just looking for other opinions on whether or not to run the 43TS or jump up to 44 or 45 model plugs. And what about the Rapid Fire? Currently I am running all stock ignition components. Help a brotha out.