i don't think gm put any tall deck blocks in the 1/2, 3/4 , 1 ton trucks, the tall block is found in dump trucks, buses, grain/farm trucks, boats, saw one used in an industrial generator, if your looking for a tall deck make sure you check the casting numbers at the back of the engine, GM made a 427 tall block and a 366 tall block, the 366 block is basically a boat anchor, the crank and rods in the 366 are the same as the 427 tall block, could use the heads and intake off 366 tall if your building a stock engine, the distributors are also interchangeable between the 366Tall and 427tall, hope this helps