The block drain plugs are just above the knock sensor here and on the other side of the block in the same place.

ok guys, thanks very much, especially bill, for taking the time to write a complete and knowledgable answer. your understanding of bonnevilles is vast. i will try removing the lower hose and make sure it drains in a bucket. i was just wondering if i pulled the coil wire and turned the motor over with out starting it, would the water pump pump more coolant out. just a thought. once again, thanks for your help!

Don't know. Never tried it. I would guess that it would not make much difference, but you could give it a try and let us know. You might want to disable it a different way, though - IIRC, by unplugging the connector to the ICM. You want to disable the injectors if you are gonna spin without spark. One of the smarter electrical guys can confirm if that is the proper way.

It wouldn't do much. The water pump is a centrifigul type so it has to spin fast to pump anything at all.

well i tried the bottom hose drain but got out less than a gallon of coolant... i ended up going to goodyear and letting them do it with their special machine that drains it all. it was 89.00 for the procedure. i figure that by the time you add in the cost of the antifreeze and flush, disposal of coolant, and time spent, not such a bad deal.