408 top end changes, new trick flow heads??

They used to use Engle, see their archives for specs
I'm guessing Howards looking at the specs
speaking of howards
https://www.howardscams.com/sites/default/files/Howards2016_17_mid.pdf
and compare Mopar grinds with the 15 in the cam notes with the other universal grinds
LA
page 140 on computer 142 on paper for hyd and 142 or 144
solids 144 computer- 145 paper catalog printed on page
Other vendors also mix .904 and .842 lifter optimized masters
Crower, Crane - but do not make it easy for you to pick the good ones
I compare specs with SBC- if the same or similar I pass
Or go to their masters list and find the matching master
about that time I get a custom cam if I have time or find something similar as looking at several vendors I can find various timings- LCA's
or different spring recommendations