well it is a Buick block, it is larger than the SBC, and are about the size of a BBC, up until the late 70's all Buick V8's were all the same block designe, 350-455, they didn't have a small block or big block because there large cube engines used the same block type as the small cube engines. and yes the Buick Wildcat engines will hold there own with the right parts. '70 should be pretty good stock.