the bellhousing you need is a lakewood as the small block A body used a 4.35 retainer and the bell housing hole should be 4.35 area, the big block trans used the 4.80 hole retainer. adapter kit comes with the lakewood and has 2 bolt patterns for big and small block,runout on b housing should not exceed .. you can also just change tail shafts off a 4,80 b or e body trans for big block to an A body tailshaft. with the lakewood shield and shift rods clearances may be an issue with the under chassis headers. regards