LA 360 drop in roller lifters

While I agree the bigger roller is better, consider this. From a .700 roller to an .800 roller we all understand is .100" difference. From the pinion center to the outside surface, that's only a .050" difference. Now, stack .050" up on a feeler gauge and ask yourself if it's worth "that much" more money for the bigger rollers for what "YOU" are doing.
If you did the math or could measure the loads involve in the upper rpm ranges that these engines see, I bet you'd be surprised in the difference the roller diameter and can make. I'm not going to attempt the math, but I am betting it is not a linear relationship.