Recent content by new miata

I'm new to this scene iv done Integra stuff before first Mazda i have a 1993 Miata mx-5 with 56k miles 5 speed. it also came with a b6t as an extra not including the motor that's in it. i dont know if it is better to sell the b6t (how much could i get?) And would it be better to just put it in?