Small block 426 stroker with trickflow heads. How much HP.

they may not hurt you as much as you think.
I ran those headers on a pretty mild 416 years ago
3350 pounds with me in it..
416, excellerator with no work, mildly ported eddies(275 max)
260/266 600 lift flat tappet PRH specced, ran low 10.70’s at 124
11.5 compression. 727 tranny

That would be nice. My exhaust is not going to change. I dont like fenderwell headers and will keep the mufflers on it. It does get stret driven.
Race weight is 3450 lbs. My 408 went 6.57 @ 104. Never got a 1/4 mile pass.
The 426 should be a little quicker.