If I absolutely HAD to put a V8 in one of my trucks, (which would pretty much require somebody putting a gun to my head) i'd go with the 327.
Years ago I had a '67 Impala SS with a 327 and she flew like the wind.. I imagine the '67 Impala was probably just as heavy (if not more so) than a '53.
"Good deals" are relative to your area.. for my area, thats a little on the high side, but what I pay $300 for, folks back East pay $2500.
I'd personally not pay $3500 for anything unless I can hop in it, turn the key, and putt on down the road in it.