I think the 360 Magnums were 9-1? If I were in the OP's shoes, I'd buy one, rebuild it with a reground cam and a performer intake, drop it in an A body with some 3.55's and have fun.
I’d agree with that. I’m building a mild la 360 with stock heads, cheap headers, airgap intake, and a nice carb. Also with 3.55’s. The magnum 360’s are really cheap and good builders for a fun a-body.