That is Mike Myers car . I got to talk with him for a few minutes at the Corvair convention in Kentucky awhile back . it sits on a G-body frame. it had a different motor in it then. he was at the Power tour this year a friend told me.
it is a beautiful car . cruise in it all day , good fuel economy , common parts and good looks to boot. and it will take a big block.
here is a link where you can see details on it.
http://www.v8vairs.com/vehicles.htm