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

I run little bit more of a muffler. Dynomax Ultra Flo offset 3" that dumps in front of the rear housing. Also have a Pypes 3" X pipe. I have never made a run with open headers so I dont know if there is a difference or not.
Hopefully will find out soon what it will run.

I had a hot 406 vega , w/ dumped 3'' flowmasters , .003 diff. w/out , think it was mostly just the weight diff. !
The drone was terrible .
IMG_0235 (1).jpg I have 3 1/2'' dumped on my 440/505 now , w/ home built mufflers , no drone -----------