Thread: Auto or Standard in my Rod proj

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I'm building a ShadowRods steel XL27 roadster..27 body on a 32 frame with 32 Radiator shell/rear gas tank.
Trying to keep the cost down, old style basic rod, clean with some chrome but flat black enamel (cost and look).
Reman 350 chevy Hipo w/ edelbrock carb..ford 9" w 3.50 gear. 255/70 15's in back and smaller skinnies up front.
I need a 4th gear OD auto or a 5 speed manual.
I'm looking at a reman 200R4 with a .67 4th gear and a warranty or picking up a used T5 Camaro 88-96 5 speed box.
Gotta have long legs in the country side of Az...lots of legal 75 mph cruising and a 3 speed would eat me up fuel wise.
Pros and Cons or just opinions appreciated.
BTW I've never had a 'fun' car with an auto only standard so am leaning that way but in the end may be more expensive (tach, emerg brake etc).
Fire away.