Hello fellow bolters

finally looks like spring is on it way up here in the north. anyway I have a 46 1/2t 216 that I am fairly sure that the engine is original and the exhaust connection comes straight down to connect the exhaust pipe and I have another 46 truck I bought for parts and the exhaust connection is at a bit of an angle towards the firewall I am just wondering what year it might be as it could have been changed or why the difference Thank you for you help