Hi! Im looking back on my stroker build 440 to 493 cui 2 years ago that be a succes. I have about 2000 trouble free miles on it now. I just think of all the grining in the engine block that i have done that no one else have done when they have built a Mopar stroker from a 440 block with a 4,150" crank, 6,760" H rods. I had to grind for clearance in the oil boss a lot and also in the 440 source 3/8 oil pick up tube for a 7" deep oil pan(see added pics), in all cylinder bottoms for clear the rods and als in 3 places for the crank counter weights. Is there really so much difference in the blocks? I must have get the one really special block (440 -77) because i really needed to grind alot to get 080" clearance everywhere. Just a thought. Im really happy with the engine, its a street engine 10,4:1 with a pretty mild 231/237@050 cam, making huge torque and is perfect in my Chrysler 300 -64.