I think that if you can port them yourself (don't bother with polish...the improvement is insignificant for a street car) then by all means do it. If I didn't have the ability to port heads myself, I probably would not have used '70 351w DOOE heads. My heads have 1.94 and 1.6 stainless valves and they are ported extensively. The intake volume is 160cc after porting and the exhaust volume is not known exactly but they are way bigger than stock. After porting them, I spent something like $550 to $600 to have all the head work done including bigger valves, guides, guide plates, valve job, seals, decking, etc.
For a $600 investment plus the cost of the heads if you don't already have them, they'll do a nice job on a street/strip small block up to 347 ci. Lets say hypothetically your extra 16 cubes + 335 SAE corrected RWHP of my 331 nets you somewhere in the 350 SAE corrected RWHP area...your car will run really good and I guarantee you that you'll love the throttle response!
I have a post on the "home porting cylinder heads forum" about porting my heads if your interested.
Tracy Blackford: Corona, Ca
'65 FB Mustang 331, 282S cam, ported 351W heads. T5z, 3.50 9" posi.
346 [email protected]
on a warm spring day (335 RWHP SAE corr.)
<font size=-1>[ This Message was edited by: blkfrd on 5/23/06 1:04am ]</font>