Headers vs 340 manifolds

Ive seen plenty of STOCK 340 dyno test without mufflers it was never more then 20.
Stingy dyno? IDK, also, IDGAF. Actually, you’re the only guy to say this. Dispite dyno testing results local and national & published.

By the way, after your header install on the stock 340 you dyno’d, did you twist up the timing and re-jet the carb? Stock carb? Which carb was used?
Stock builds thru manifolds make 340 hp downhill with the wind.
I didn’t follow this sentence.
You are not getting 370 hp bolting headers on that top of the line build with a stock cam.
That for **** sure! But then again, I have wondered what would happen with enhancing the insides, non stroker, in a build no one would actually do. Like a 13-1, methanol fueled, etc…