Hi
Better with 2x 385 types 360s may struggle a bit, no idea on brushless, no point you do not ned to save weight and you only need about 4-5k RPM, why not follow what it suggest in the instructions ? and make sure you do NOT use to long a couplings or you will not have room to fit them in, and if you move the bulkhead fwd ( as some have done) you will be in right mes when you try fit the deck
ron