Sorry but another 318 cam question.

I've got a Lunati [email protected] lift roller I bought to put in an LA roller 318 block with Magnum heads.

I think you will be OK.

Look for M body cars with an 8 1/4 axle (it's real close to the exact length for an A) and then pre'97 Dakotas with a 8 1/4 and 3.55 gears (pre- '97 gears and carrier will interchange with the M axle).
Long way around but I bet they're easier to find than an A body 8 3/4...and cheaper.