the reason I asked is a guy that built a "34 hudson and has won a few good guys car show awards told me that changing the motor and all that it would be wise.
I would question that "wisdom". While there's nothing necessarily wrong with doing upgrades or even frame swaps, it isn't something that "has tt/should be done" to make an older vehicle enjoyable to drive. There's plenty of us on here (myself included) that use our trucks regularly with stock suspension and brakes, and even the original engines.