Opinions on a 340

would like to chime in here my old motor 340 30over pop ups 915s with 208in 160ex 528purple solid 3'' ex sounded wicked burned 275x60x15s to the ground 410s helped idled at 1000rpms the 915s have a large chamber i got away with 93 octane and octane booster.imo use flat tops and zero deck the block then u can run 93 or premium fuel all day long