I run a 35 over 455 with 220 cfm 96 d-ports.
With the xe284 the car has gone an 11.98 at 3680.
It is a lumpy idle at 1000 rpm in gear.
This combo may have made more avg power with the xe274 but I anticipated a head change. I would think the 274 probably has better idle qualities.
Point is- you have 20 more cfm I would think about a cam this slightly bigger than the 274.
Might even consider a suitable Hyd roller to avoid the issues with flat tappets.
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