When good is not enough, Camshaft time again.
I am not sure if Ma did get it right the first time.....
Looking just at FT cams, the limiting factor to max lobe lift & area under the curve....is lifter diam. The 904 Mopar lifter allows for more of both.
A friend has the MP Hemi book & he was looking at the MP cam, 296 adv dur SFT for his Hemi. Using the supplied 0.850 constant, duration is 251 @ 050. Lash is 028/032. So a lot of lift is lost due to lash. I found an Ultradyne 904 lobe that has the same 251 @ 050. Adv duration isa much shorter, 278*. The big kicker is the NET lobe lift. The UD cam uses 0.016" lash. There is 0.036" more lobe lift [ after lash ] with the UD lobe.