no the heads that came on a 78 305 are large chamber low compression heads with fairly small valves.
high output heads are the way to go look for an iroc or some monty ss's have high output 305's.
getting a set of these heads is cheap i picked up a set for 30$
the big money was getting them machined.
l98 iron heads off of a 350 ta or camaro had 70cc's.
the aluminum off of the corvettes were 64 cc's with 1.94 1.50 valves very good heads