More parts ID

I recently bought a trailer of parts, mostly mopar stuff. I ended up with some /6 stuff.

Looks like these are from engnbldr, (Engine Parts Network)
6 stainless intake 1.7 (567EPN on the stem)
6 stainless exhaust 1.44 (1265EPN on the stem)

The springs appear to be...
Mopar Performance #4120249 {Stock 340 Replacement w/.206" Coil-Wire}
12 springs with dampers and red stripe painted on them. (1.497 dia, 1.96 un-sprung height)

They have undercut stems, swirl polished and hardened tips.

I am trying to find out who uses those part numbers, google has not been my friend.