My question is about 383 stroker, and the best heads to use. 305 heads or Vortec 12558062 gm cast heads?

At this time i have a set of gm 305 heads and it runs great but i have to use hi octane gas and i am sure it is because of the high compression caused by these heads. I have a set of gm vortec heads with the #ers 12558062. would they be a better choice and would i loose or gain on the way it runs. As you can tell i'm not a real gear head yet.