I was going to see about bronze valve guides. I am also looking at undercut stainless steel valves and Z28 springs. I think the heads will be the most expensive part. I looked at a set of world SR torquer heads already set up, and found a set for $700. If the heads start to approach that, I will just do that. I really need to find the flow numbers for those heads with the SS valves installed. The only draw-back to just switching to the WP heads is that it is $700 all at once, instead of little pieces at a time. If I get the old car sold, then no problem.