block identification concern

It’s a 361 or 413. I tore apart a 413 like that. It had a good 6 bolt forged crank, the block had extra ribs along the outside. The intake was totally normal... had a holly vacuum secondary carb. The rockers and shafts were normal. The heads are small ports and valves with closed chambers, small block type plugs, normal valve covers. The exhaust valves have larger than 3/8 stems, I think they have sodium inside. I think the 413 had 400lbs of torque @ 2000 rpm