Have a 1971 charger that I need to completely recharge the system as it was just opened up. How many lbs does the whole system use? Anyone ever try this stuff instead of the R12?

http://www.ebay.com/itm/6-MAXI-FRIG-12a-REFRIGERANT-OIL-STOPLEAK-R12-ADAPTERS-HOSE-GAUGE-1994-OLDER-/111852354784?hash=item1a0aeb7ce0:m:mDoB_UfSWFiD9_3Kvd2rwvA&vxp=mtr


1969.5 A12 Bee EV2
1971 Charger RT
1973 Duster tubbed 500 low deck 10.90 monster
3 440 polara vert projects