I replaced both of mine back in the early 80's with nothing more than a Tom Monroe book and basic hand tools to use. I didnt get my power tools until yrs later
but then again I was 23 full of gusto and attitude. couldnt say id want to do it again now without air tools.
you do have the while youre at it factor, so nows the time for a head rebuilt with hardened valve seats, maybe new valve train, if not already done recently;timing chain, water pump,
1970 Mach 1 San Jose built Dec 23 1969. Marti says 1 of 7. Purchased in 1987. Original family owner of the powertrain 351C 2v FMX.
1993 GT 11,000 miles, Built 2-12-93 Auto, 3:27 Axle, cloth, sunroof. Untouched except for rubber and battery, Purchased new 8-3-93. still has the factory windshield fluid and new car smell.