[1978chevy]

I'm building a '79 4x4 dually with a turbo 400 transmission and I'm putting a '89 454 in it, the truck is just gonna be used for towing a couple vehicles at a time, I'm wanting to get all the horsepower and torque out of this engine that is possible and still drive on the road with no problem, I plan on stroking it but I just don't no what size to go with so my questions are

which is best to stroke it to 496 or 511?
what are the best heads cam and intake I can get to give me the most towing power?
and finally what kind of horsepower and torque do you think the set up will make