The stock rod and domed piston work nicely, but if you're needing a new rod, then just go ahead with the long rod and piston combo at the same time. .310" lift cam, 2X valve springs and have the carb made stock appearing.
Now, I don't know how "built" the clone on alcohol is, but this WF combo is a nice and cheap build of decent power.
You really could use a bigger carb (28mm Mikuni would be my choice,) then you can go up on valve size to better accommodate the carb, followed by 1.3:1 roller rockers.
I just finished a similar build and the customer is smiling ear to ear.
Today, it's back to a stock WF for Jr sprint racing.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
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33 years of service to the karting industry ~ 1Cor 9:24
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bcarlson@CarlsonMotorsports.com