A fair number of years ago I contributed time to the SETI project. Is there any process to have those credits reinstated or carried forward to my new account?

If it was "SETI Classic" then I'm afraid the answer is No, but you can have it displayed alongside your new credits.
If it was the current version of credit scoring then, so long as you know the old email address and password you can reactivate that account, change email address to your current one and continue where you left off as far as credits are concerned.

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

My question is in the same vain as the OP. Though my problem is that the info and stats from my old "classic" account (before BOINC), is what's being used in my new BOINC account. And since my email address has not changed, that may be the cause.

In light of this, I would be most grateful if I could find a way to correct that.

You have the account set up but no computers attached to this account. Your account should use the same email addy that you use to log into S@H. If it isn't you can't move the old SETI@HOME WU's so you'll have to log out of the current account you are using to crunch( that is if you are) and login to your account through the Boinc Manager using the same email as you used here to start crunching on this account

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope