Small Block Mopar Engine Date Code 3-4-66

Block has a date code of 3-4-66. Not sure of the numbers on the side of the block. I think that this is an early year 273. Info I got was that this motor came out of wrecked 67 Dart GT. I removed the rocker arms and got the numbers off the block. I cannot post the pictures I took of the block. For some reason the upload keeps failing. The numbers on the side of the block are 2806030 and the numbers on the heads are 2843675. Cannot tell if the pistons are domed or flat.