This should help...
http://www.chevelles.com/forums/showthread.php?t=369648
The L78 was the same motor 65-69..*the 1970 version was a 402..same hp rating..low profile intake
The L72 was the same motor 66-69...
Factory issues with HP ratings to satisfy insurance companies were routine...that L72 probably made more than 450hp if it was set up right.
either way both motors are awesome [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]