Nah! I’ve used them before. Had to do a bit of grinding around the push rods to make it fit. Then the cut out on the edges to make it sit better. I could just “feel the power!”
Lol! Made me happy.!
The 273 I had Larry’s Automotive machine shop build me that made 317hp at 6k and just over 350hp at 8k ( we left the rev at 6k due to the obnoxious valve spring pressure required) anyhow- they did not install a windage tray as they worried about oil not draining back fast enough and the car starving for oil at higher rpms. Stock pan so a larger pan may prevent that. Their words not mine. I’ve always used them until this engine.