can anyone help me get an extra 200 hp out of my stock 340 what parts do i need to change or what never can get anyone that i talk to with a straight

What do you consider “parts” to be?

As others have noted, you’ll need a full rebuild with LOTS of parts if trying to get there NA…as in most of the stock stuff aside from the block goes away.

A nitrous kit will get you there quick, the “500hp” mark AND the “needing a rebuild” mark.