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

Here is a good cam for your target if you do go on the boost path.
Howards Cams, Street Force Hydraulic Flat Tappet Camshaft, Chrysler SB 273-360/318, 225/235 @ .050, .465/.470, 112 LS - Competition Products
I do like the thought of a blow through pro charger setup, especially if you are open to mixing your own e60 to e85 blend gasohol.