The flywheels will interchange. The difference is the 11" flywheel has a 144 tooth ring gear, the 10.95" one has 130. This requires different bellhousings, casting #2892262 for 69-earier B-body 383/440, and #2892513 for 70-up B/E -body 383-440. With your B-body, either should not be a problem, but on an E, the 11" will get close onthe floor hump. Hope this helps.

"IF YOU'RE UNDER CONTROL, YOU AIN'T GOING FAST ENOUGH."