Mild 383 build

Lolol!!! OP's proposed combo; "3000 stall", & "292° cam", then the pistons.
This build is still up in the air far as I know nothing is a 100% decided and I've never said that this combo of parts is the way he should go, I've repeatedly have said he should pick a cam and cr that works with his parts, I've said probably around 224-236 on 108-110.
Your dyno chart resembles neither a 292° cam @.006" tappet or worse @.015 tappet lift. For an under-cammed engine to only pick up ~6-7hp @3K shows it's a loser at low rpm, the combos You posted will all suck w/a 3K vs 3.8K stall...but the 285° unit will be killing it there.
The point of the dyno chart was towards his side quest question about low cr and a 292 cam, closest I could find :)
Using those "% gain/CR increase" charts is really for a narrow range of "street" cams, not for cams in the 292° range, it just isn't.
Lets not ignore the fact that BBM's have horrible open chambers & plug placement that burn SLOOOWWW.
Fine, Whats that got to do what I said ?

For whatever reason Fishmens67 seem to take issue with me saying a displacement of 396 should be able to make decent torque and it is only less than 20 cid from the popular 408 choice (which is known for torque) and he brought up longer stroke to me. Then there was a little back and forth now you want to jump in and argue arguments that I didn't even make.

My whole original point was people always remember longer stoke has more multiplying effect but disregard smaller pistons applies less force to be multiplied. That's all I was saying.