i use a wobble socket and a long extension and get all 6 from underneath. i use 3/8 because it is smaller, and adapt it to a 1/2" driver at the end.

the wobble should be impact style because it is round drive, and stronger than the chrome square drive kind. they can be had at sears for about $10 for a universal wobble. about another $10 for an adapter, and another for a super long extension. dont just pile extensions together, you lose torque, and they can come apart and hurt.

you can also get the top 2 with a wrench from the top with the distributor out, if that's the 2 you are talking about. they are all on the sides. you only get about a quarter turn at a time tho. the center and bottom bolts can be had easily from underneath with an offset box wrench.

it is best to pull the engine and transmission as a unit in these cars, but i know sometimes it is not an option.