for all out horsepower the splayed valve Chevy head, or the sb2 or 18 degree after that
There are many places where one could purchase small block Chevy heads. Some of the best places to purchase small block Chevy heads at places like Amazon or Auto Zone.
The 350 has, over time, been the best, most versatile, small block, ever.
Best place is in one of the cylinder heads, by the spark plugs. Or, the intake manifold, near the thermostat housing.
180 is best.
Go to search on your computer and type in small block Chevy engine ID and you should find your answer there.Most 350s id#end with 010,which is a early engine,and if heads are off there will be a small hole between the two center head bolt holes.But the best way is ID#s.Hope that helps.
Small-block Chevy The 454 Chevy big block offered much more available power but was horrible on fuel economy.
72-75 AC R44T 76-80 AC R45TS
Chevy 350 bored 60 over. .... not the best way to come to a 358... The "NASCAR" way is to use a 400sbc block and a 327sbc crank. High revving and big hp up top.
600 cfm should be just right for a stock or slightly modified 350.
I believe the Chevy small block is the best bet for ease of change over and thecheapest.
If you're wanting very streetable power then you need to take a look at AFR (air flow research) heads. They took a stock 302 ford, did nothing but change the heads and it gained almost 100hp. Howerver for big block applications I would look into the Brodix line.
Chevy 327 Small Block, or Chevy 427 Big Block for horsepower, being bullet proof, very inexpensive, lasts a lifetime. Just really personal opinion really. :)