I was thinking bout doing some head work before I get the new short block. I cant afford to get a full port and polish, but how much would it help to polish the heads myself? Not enlarge the ports really but just smooth out the rough finish from casting? I made 435 with 15 degrees of timing @ 13 psi but cut it off at 6100rpm. I plan to run it to 7000rpm with the new motor . My tunner said the heads get restrictive when you near the 500hp mark. Is it worth polishing the heads? I was thinking bout doin the exhuast manifolds too, as much as possible at least.