High Compression 390

IMO, jump another 10*’s of duration. The big cubes eat some cam duration and with the huge amount of extra arm you have, torque production will not be an issue.
Also, more valve lift! With that listed valve lift, you could run prepped stock heads. Use the available superior flowing ports of the Edelbrock heads to your advantage. Otherwise, what the heck did you get them for?!?!

Last thing, why the .050 thick head gasket? Use a thinner one (.039) to get a good quench area and a minor bump in the ratio. Is a 93 octane available by you?