Buick motor to Chevy manual trans

I have a chevy 4speed with clutch, bellhousing flywheel and etc. I want to put a buick 350 I have in a rusted 71' skylark sedan into that vehicle for low amounts of $$$ . I know jegs has a bellhousing adapter plate for $50, but what is required to make the flywheel/clutch mate up? Buick flywheels seem to be very hard to come by for reasonable money these days, will an olds or pontiac flywheel mate to the buick crank? Also, does the buicks crank even have a hole for a pilot bushing since it is currently mated to an auto? Thanks for the advice, I really appreciate it. If anyone is interested in the car as a parts car, I'd probably let it go for $400 with the motor still in it, it still runs and drives as it sits, but the body is getting pretty rough. I live in Florence, MA.