Chris,
Sorry, I didn't respond to the earlier post because it looked to be answered already and I knew I had covered it in the archives; but I know sometimes it's hard to find stuff if you don't know what terms to search on. There is nothing magical about the 340 head, same head as the 130/140/230/240/330. CNKS and Shaggy are telling you right as well. Some details: yes, the manifolds do interchange, the later one flows better with easier curves and has larger ports; but has a different carb height so the air cleaner bolts don't line up unless you get the air cleaner to match the manifold (ie: late manifold needs a 130/140/230/240 air cleaner). The Super C valve train will work...(I will say with a caveat, meaning the rocker arm assy will, but some other parts should be obvious like valves and some of the springs because of rotators, etc...), water pump is not effected, upper water neck keep the one on your Super C. If you need more details it can be found in the archives, tryLink (or just edit the last 6 digit number in your addr line)
Specifically read my post 03-14-2005 at 21:04:52.
The thread was trying to work out a difference in experience with Hugh, but it never got resolved. So with a noted exception for F series tractors (F12/14 which I know little about, as they are outside of my primary area of interest), and an obligatory special exemption for Hugh's 140 ;) I still hold that all C113/C123 and early C135's are 9 bolt heads(that will interchange); late C135 and C153's use the 14 bolt heads. Early vs late I believe to be the split from the 240 to 404, and 340 to 504.
Stan(VA).
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