Free cam build...

And I'll add to what Garrett said. As for "slow rates of lift", it's much ado about nothing. Use what you have and enjoy it. It'll be easier on the valve train than a comparable "modern" fast rate of lift, which is a plus. In the end, all things equal, the difference between your cam and a "modern" grind might be 20 HP. Then again, it might not be. Absolutely zero cause for alarm. Run what you brung.