New here, need help!!!

[Tas0718]

I have a 87 Burban I bought, body and inside is in good shape. It has a 12 bolt out back and a 10 bolt up front with 3.42 gears, a 350 TBI, and a 700r. I am going to put a 3/4 ton front and rear with 4.56 gears and I will keep the 350, but I am going to put a little more muscle in it, make it around 300 horses, but I am going to be running 38"- to 40" tires, what transmission would be best, it will be a daily driver with a little off-road( hunting roads)
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