Do you know what year the motor is? Do you have the ECM that came with motor? Can you read the chip from that ECM? Do you know the BCC off that chip?

$5B is for 16183247 in 94 - 95 Buick / Pontiac L67, 3800, Supercharged

There is $5B, $5B1, $5B2, $5B3, $5B4, $5B6 and $5B7...