Could someone identify this old prototyping board?
Googling the part number (thanks for including it in a nice clear photograph!) produces:

http://www.ebay.ca/itm/Radioshack-Archer-multi-purpose-plug-in-experimental-/400966361562?hash=item5d5b7521da

So it has no specific purpose, although the 44-way edge connector will fit in your VIC-20 expansion port.