Forged 273 crank in an early 360 Block?

From 'How to Hotrod Small Block Mopar'
CRANKSHAFT SPECS
The general specifications for A engine crankshafts are as follows:

CRANKSHAFT SPIN DIA.--2.125 in.
MAIN DIA. 273/318/340--2.50 in.
MAIN DIA. 360--2.81 in.