How much HP would you guess my 340 produces?

jcolman said
My thought was that the Aluminum heads alone should be good for about 40 - 50 hp. The headers another 15 hp. But these are just guesses.

Headers = 15 hp. I’ll go for that if not more.
Aluminum heads = 40-50. Not on your ride it ain’t.
360-370 hp is the best ball park I’m going with.