Turbo six on a Budget

so this though has still not left my head and i have done a lot more reading this time. My new goal is 300 whp. The best path i see is microquirt for fuel and ignition using batch fire and wasted spark, do a full rebuild on the motor keeping the bottom end stock other then boring the cylinders over. For the head i plan to port it and get a bigger cam and springs ect. My main questions are should i get bigger valves and or deck the block/head. Also is 300whp achievable and what level of boost will that be?