does anyone know where to get some aluminum 305 heads that are at least 58cc or less combustion chambers?

 

ZZ-4 heads. They're basically the same heads as used on Corvette TPI 350 engines.

58cc chambers, 1.94/1.50 valves. Early style (86-down) intake bolt pattern.

 

I believe the heads you're looking for would be L98 vette heads.
They'd be the closest thing to a bolt on, that's compatible with your engine.
Or you could go with the LT1 head retrofit...
That's sort of a project though, cause they aren't made to bolt on to our blocks, and they need to be modified pretty extensively.

 

i have heard they bolt on fine but the cooling passages need to be modified alot to fit and also intake crossovers but this is just what i have been told have never looked into it first hand

 

No modification to cooling passages required.

There aren't any exhaust cross-over ports in them, but that's not a big deal.

 

Yes there on the LT1 heads. Alot of mods and work is needed for them to work, but i'm doing it so...

 

Were you referring to the LT1 heads, or L98 heads?

 

i was reffering to the LT1 heads. what kind of mods are needed? how teedious is the work that needs done.