Bostonians looking to satisfy their cravings for a Kelly’s Roast Beef fix should be able to avoid a road trip by next April.

The 58-year-old restaurant chain that takes credit for inventing the roast beef sandwich plans to revamp the former Marty’s Liquor store in Allston into its first Hub location. The 140-seat eatery will be the sixth for the Saugus chain that’s been named the 2009 Restaurant of the Year by the Retailers Association of Massachusetts.