cast crank 440, how much can it take????

the cast cranks can take way more than you would wver imagine. i found the same year you are thinking about getting on the side of the road some 20 years ago. i loaded it up and home it went. took it apart new baearing, rings and valve job. installed a used cam and chrysler long ram, two carter afb's and headers. put it in my 66 coronet and used it for years to tow the hotrod all over florida. then one day i kicked a rod out of the hotrods motor and took the motor out of the 66 and installed it in the hotrod and raced it for several years. got some money ahead and build another motor for the hotrod and back into th e66 it went. wanting to get into street racing i install a 3 stage nos system on it. two 125 stages and one 250 stage. beat that thing up for a few more years until it split the bathtub gasket and sucked in the insulating pad under the carb, toasted the bearings. don't be afraid to purchase your 76, it'll last along time.