i read lots of posts regarding compression and lowering compression, often the information is conflicting. i want to know the resons for lowering compression. if i was to have an engine rebuilt to handle 380 bhp with a t34/63 and siemens 55lb injectors, BD14 inlet and standard ex cam would i need to lower my compression, some say its for mapping the ignition and its easier with lowered compression. some say its fine and some say lower t, why is this? i dont profess to be fully conversant with engine building, but i just would like to know

many thanks