Just a FWIW... When using TD's paired rocker system beyond .750" valve lift the rocker sweeps well past an ideal position (offset from center). I saw this on two different 440-1 Indy's applications as shown in 440Jim's post. Therefore it would be prudent to offset machine, and while you're there add some keen certs, the factory hold-down centerlines. We had both heads done here locally and added two dowels per head.