Originally Posted by JeffB
You could get the head from an earlier 250 that had the separate intake and exhaust manifolds then you can have some fun:Chevy 250 Inline Six - YouTube
Yes, you have to change everything on the top of the engine and fab linkages and exhaust. Then there is the problem of soft exhaust seats..
I can't get any later 250 heads locally for years. All the heads are cracked.