Yes, Ls heads!, all you have to do is buy the new block. Kind of a non starter in your case. If your block will easily accept roller cam the roller valve train that will make most all old style 350's feel lame. And there are several late model heads that will make old school Camel Hump 2.02's look bad. The book by David Vizard tells many good and reasonably priced secrets.****** Lately there is much "talk" about flat plane cranks, A customer had us install one in a small block in 87, I think it was Lunati billet crank? I don't recall how it worked out for him, which tells me probably "not good" or "didn't like it". (He was a Corvette nut and spent his daddy's money like water.) I don't know what he was expecting. I recall the engine ran but the results are lost to time. It wasn't my toy so it just looked like a money pit to me, I was a 25 y/o guy just trying to keep his DD's running down the road so I could keep my 2 jobs and didn't end up moving back in with Mom and Dad!