The Ford Shop Manual (FSM) is the typical source, otherwise the cam mfgr, or something hopefully reliable such as Summit Tech Pages
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So what does the cam maker say?
Fastenal has recommendations depending on bolt grade, e.g., 58 with oil on a 7/16-20 Gr8.
[EDIT] After some checking out of curiosity, torque for this part is nearly irrelevant, based on the stresses it sees. Most of the forces are tension, which are very low, and little of shear loads as the tab or dowel pin resist those. Tight enough to secure is good enough if using a thread locker, or tight enough for bolt stretch to retain the bolt from vibrating out if using dry or lubricated. What's tight enough? Try this on from NASA sources which use this chart, adjusting for the KSI of the bolt you're using:
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Source: engineeringtoolbox.org
Fastenal has recommendations depending on bolt grade, e.g., 58 with oil on a 7/16-20 Gr8.
[EDIT] After some checking out of curiosity, torque for this part is nearly irrelevant, based on the stresses it sees. Most of the forces are tension, which are very low, and little of shear loads as the tab or dowel pin resist those. Tight enough to secure is good enough if using a thread locker, or tight enough for bolt stretch to retain the bolt from vibrating out if using dry or lubricated. What's tight enough? Try this on from NASA sources which use this chart, adjusting for the KSI of the bolt you're using:
Source: engineeringtoolbox.org
If unsure, then use thread locker, and something more than finger-tight. 
A 7/16-20 isn't going to let anything go anywhere if it stays put.
A 7/16-20 isn't going to let anything go anywhere if it stays put.as per ford performance solid roller instrustions i found calls for 65# for 7/16 20If unsure, then use thread locker, and something more than finger-tight.
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