casting book claims:
Block casting #14093638 - 350 86-87 truck or 87 Camaro
Crank casting #14088528, can't find...
crank casting #14088526 - 305 85-89 truck, 350 86-89 truck, 305 86-89 passenger, camaro, monte carlo, 350 87-89 camaro, corvette,
sorry couldn't be more help.
