HOLD ON NOW,
the pontiac 867 casting is a good casting.
Depending on whats been done.
I have a set I had redone by Self racing that will flow 360 cfm at .800 on intake and make some impressive power.
these have their port intruders in them.
yer best bang per buck has to be their 18* clone cnc ported setup.
they are oval port, brodix heads with Self racings CNC program.
they flow on intake @.700 aprox. 420 cfm
so capable of 900-950 hp out of a small block
cost with good springs, valves etc. $3400 ASSEMBLED.
VERY GOOD DEAL!
Put those on a stout 434 and a good cam and go racing !