Yup. I saw a 235 or a 250 - something I6 - last year that someone dumped out of their truck, plus the sm420 tranny - 'come and get it' last year on the chevytalk.com page classifieds. So, keep an eye out...

a place to look at ads and things:

http://woogeroo.home.mindspring.com/6066trucks/tips/usedparts.html

-W