what is largest cam for 340 with factory 10.5 flattops????????

I have had 2 cams in this engine over the years. Both were Crane cams. Specs are actual lift and duration.
1. Duration: 278* 290*
Lift: .467" .494"
2. Duration: 284* 284*
Lift: .480" .480"
I am currently running the 284* cam. I am wanting to put the comp cams 292* with .501" lift in it.