I fired up the rebuilt 351 in my 55 for the first time tonight,it has no exhaust but sounds good except for a little miss in one cylinder but I hope its only a plug or a bad wire. It moved forward and in reverse so it looks like the junkyard trans might be good,i only had a couple of small coolant leaks and it did not overheat while breaking it in so I hope everything is in order. I have to pull the distributor out as it needs to be moved a couple of teeth as its turned all the way to the thermostat housing,going to fix the little things tomorrow and maybe go around the block and see if the trans shifts and how good the brakes work and start working on the trunk floor so I can take it down to the exhaust shop and quiet it down a little so I can check for motor noises.