I agree with these guys if you're wanting to keep it as close to original as possible... if you are not... heck why not go all out and put a 88 or newer frame and running gear under it?
I DO know that if you have the stepsdie bed... (doesn't matter if it's long or short) you can go all the way back to 55.
Best of luck.
Boogity, Boogity, Boogity Let's go racin boys.
Drive fast, turn left. GO #20.
Real trucks where bowties.
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