Originally posted by Damien_63
Will those be sufficient for a 383?
yes , and you will need a fan shroud , or run electric fans.

if you install a cooling system properly and maintain the cooling system, it will handle what ever you can through at it.

that being said, how old is the heater core, will it be used, you may want to replace it if you think its bad. if your installing a 383 engine into the truck what type of fan will you use, electric or mechanical, a mechanical fan will benefit from a fan shroud and make it more efficient.