With 10.8 CR and pump gas I expect you would be fighting detonation and wanting a high duration cam with higher LSA. With the E85, detonation should be under excellent control so a cam that builds more torque and cylinder pressure is beneficial.

FWIW I think 260 degrees is too much for your combo... the standard port heads will run out of flow at moderate RPM anyhow so you just loose useful mid range torque with high duration. I'll suggest 240-250 @ 108 LSA.

If it is a dedicated drag engine with high stall converter, ignore the above comment.