need help deciding

[drgoldfoot]

everyone in my family are chevy fans but ive always loved fords Recently i have found several cars on some hunting property that i own i want to put some power in a 91 4 cylinder mustang i have a 390 a 351w 351c i want to know which would be the best for my application the motor will be relatively stock maybe bored out but will not be used for racing these motors are in 60 and early 70 model cars all in which had hoods on them none of the cars have been driven or ran in 20+ years so i know a complete rebuild will need to be done if any one can it will be appreciated will the blocks come a part fairly easily or is there a trick to removing rust engine bolts thanks