Unknown Crank Pulley ID

[LSS&B]

• Unknown Crank Pulley received from friend, on right in pictures. Need help with ID, What engine does it fit?
• Measurement front to back 2 7/16 inches
• Front belt groove outer diameter 6.70 inches with dial caliper
• Rear belt groove outer diameter 6.15 inches with dial caliper
• My current Crank pulley (on left in pics) with bunged out bolt holes matches Bouchillon specs 1965 & later B/RB engines & 1970 & later A engine BPE Double-Groove Crankshaft Pulley - Bouchillon Performance Engineering
• Measurement front to back 3.25 inches
• Front belt groove outer diameter 7.375 inches
• Rear belt groove outer diameter 6.55 inches (6 9/16 inch according to Bouchillon, but close enough given rust pitting)
THANKS