There are Chevy V8 exaust valves with the same size as the 235 exhaust valves. I got a set for half the money they charge for 235 valves and have 2 spare ;-)
The only difference is they only have one groove.
Instead of the lousy o-ring valve stem seals you can use the rubber caps of the Ford (there goes the F..Word) engines.
They seal way better anyways.
Also go to
www.Kanter.com They sale complete overhaul kits that may be cheaper.
...well at least 3 years ago when I got mine for
750,-
I wasn´t too happy with the suff from Patricks, but thats an other story.
Frank