Yes, that is one of Howard's 'optimized-for-.904-Mopar-lifter' mechanical flat tappet profiles, per their lobe lift; .200" duration at 157*. I've been looking at the smallest one in that series for an application.
If I were to go solid in my 318, it would be that one. I don’t have enough compression for it right now. Heads would probably need machined for that stick. (Spring seats and guides).