the 318 might be a little too tough for the tranny.... and yeah you'll need a transadapter kit, but you can also take that tranny to a shop and have it built to handle more power.... the thing i would worry most about is the rearend, because it was definately not made for that kind of torque....of course thats what an aftermarket 9" is for.... i wish i knew more but the only old mopar car i had was a 48 dodge business coupe with a 318 and an auto... the guy i had bought it from had already done everything to it... and i only had it for 2 weeks before my mom made me get rid of it....