I'm trying to put together a new engine for my '35 chevrolet. First off I drive the car a good bit and I usually make a 1000 mile round trip every year to pigeon forge on this car and I'd like to start going on more trips to to nats and such in the future, so I need it dependable. I've got a set of world products sportsman II's I've been hanging on to and a set of '69 186 castings on the 355 in the car now. I've got a 350 4 bolt block that'll clean up on .040, a '509 400 2 bolt block that'll clean up on .040, and 4 bolt 400 that is shot and I've got 8 sleeves to put it back standard. I'll build Either a 383 or a 400 and either way I'll be buying a rotating assembly so the money will be the same either way. I'd like to get as much power as possible so I'm leaning toward the 400 but I'm wooried about keeping it cool. I've got a Custom Auto Radiator 5 row radiator, not aluminum, Cooling components/walker electric fan and shroud, Edelbrock water pump, high flow 180 deg. thermostat, and I've got my headers wrapped and the pipes wrapped back to about the front seats. I've invested around $1200 in the cooling system. The car got up to around 210 idling in traffic last summer with the sending unit mounted in the head which is a little hotter than the intake. I'll be moving it to the intake on the new engine. I have since installed the edelbrock water pump and wrapped the exhaust so it shouldn't get quite that hot now. Going down the road it runs around 170 with the 180 thermostat. I want to build the 400 and if I do I'll pay close attention to the steam holes and try every trick I can find to help keep it cool, but something inside tells me to build the 383/385? Of course I'll be trying to get the quench right and the dynamic compression around 8:1. I have no personal experience with a 400 I've just heard horror stories. What would you do?