10.5:1 is fine to use on 92 octane, it will depend on what camshaft you want to use & keep your quench tight.
For example, a camshaft w/an advertized duration of 204 @ .050 on a 114 lobe center & running 10.5:1 is not going to cut it.
You could run it, but your timing will need to be on the conservative side & light throttle.
I cant say for sure ,but in general, I believe the 292 will tend to detonate more than a 250?
Correct me if I am wrong guys.
MBHD
