I used the EPN valves both intake and exhausts. I would say that they probably are the proper application with the possible exception that since the valve train is being modified from original, I find that using +.100" tips as very helpful.
Those appear to be standard tip length. Not the +.100 length tips.
If you don't know what that means, it means that the valve is longer above the valve locks. This means the tip sticks up higher and enables you to choose from a variety spring retainers, or more correctly various offset retainers and not have the rocker arm tip pushing on the retainers rather then the stem of the valve. That tends to be the case with stock length valves.
Using the +.100 enables you to assemble the spring height to specifications in order to retain the designed geometry for the rocker arm position as well.
So since essentially you will be using big block (either Ford or Chevy) valve springs, and those are designed for 1.88" assembly heights. The spring for the Cleveland is assembled at 1.82" height.
Usually this also means that you need to cut down the original cast in valve seal towers and you will be using something like the pc teflon seals.
Sounds complicated but it isn't, just lots of details to consider and using the +.100 stems helps or more correctly stated, makes it possible to do this correctly. Both the valve locks and the spring retainers are also available in +.100 offsets to enable you to get the correct assembly heights with other then stock components. Hum? Maybe it is complicated?
YOU need to check for that detail on the Cleveland valves since it isn't often stated whereas with the small block Fords and Chevys it almost always is offered as an option.
IF you intend to do the assembly yourself, you should cut the seats with three angles and the valves also, plus you need all of the cutters and personally I would cut out much of the cast in valve guide in the pockets and go with the bronze pressed in guides.
If you are willing to travel a little to get the heads done right, take them to Joe Lapine at Danbury Competition in CT. IF there is a Cleveland expert in this section of the country, he's him.
He can flow them for you too.
