[Batman]

You'd have to check valve clearances but if they are small valved heads they may work. Another thing to consider is if they are old 327 heads and you have an 86 and newer engine (not sure what you got) you need a different manifold or have to modify some bolt holes on the stocker. Plus 350 heads are going to make your compression ratio drop to around 8.5:1, whatever you may gain in air flow you just lost in compression. Stick with the 305 heads or Ebay a new set of 305 heads, they are cheap as hell (can get a pair for about $100 used).