Corvette heads are sought after you can sell them and buy a rebuilt set of 305 heads.
083 are 64cc heads normally hot 305's have 58cc heads. if its less compression its going to fall short on power for sure. But i am not much info on 305 engines i just toss then out of the way for something larger. But they can make some good power if done up right.
You may be able to find 58cc heads pretty cheap. They have small bore so many ppl over look them. I have used the heads before on larger engines to gain compression. But not a good choice for any major power upgrade. But will make a nice little street motor.