Nice looking 37. What size is that hemi and are you running all carbs or just three. As far as not moving the firewall in my truck, yes I do have about 2" of clearence for my distrubutor, but the radiator your talking about is out since I just put a new one in. With my 305 in there now, I only have 3" from water pump pulley to radiator so I have to run front mounted electric push fans. If I go with the 348 or 409 block, I'm not going to have the room I have now. I'm 5'10" and there not much room. I have a tilt steering wheel which helps, and I might be able to move my seat back another 2" but would have to take out sspeakers I have mounted behind the seat.