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Your opinions on my engine rebuild please

850 6
Time to rebuild the old six banger. 1967. A local machine shop will do a full rebuild of entire motor and head including a new crank for $1200--(I need a new crank)This is a shop that does all the work in house. I found a place that will do it for less but they ship the head here and the block there and blah blah blah some guy making 5 bucks an hour ends up wrenching on your motor! Does this sound reasonable? I want to keep the car all original so rebuilding my existing motor is the best idea I think. Your opinions? Also I have heard I should put in bigger valves-I think someone said chevy valves (yikes) Have you heard of this? Thanks