1 3/4" Headers Verses 1 7/8" on a Healthy 408....Is There a Big Difference??

Well, if you've got a "stout 408" WHAT exactly are your intentions if not to get all the power you can from a small block in the first place? lol So yeah, I agree with your cylinder head assessment 100% Can somebody say Trick Flow or Indy?

Trick flow heads arent gonna get all the power possible out of a stroker either. They are dinky 190cc heads.
I have already had 9 sec street driven N/A smallblocks.
This new build is all about having a respectable 10 sec, reliable, repeatable, car. Spending another grand on headers to maybe make it go a tenth faster isn't important to me.
Frankly, i am worried about the 8.75 holding up with what i have, as is, already.
When you think this stuff through, and have had a bunch of these type motors( i have) there are more considerations to take into account than those who haven't done them are sometimes aware of.
For instance, bet my car would also be faster if it didn't have a flat hood, but it does, and i like it. Would also be faster if it wasnt 3300+ with me in it. But i don't want any fiberglass on it, or gutted interior, etc, etc.
Everybody has different priorities.