273 swap to 318/ build, cost, potential, daily driver

factory stock, low-compression LA360-2V short block, with your 318/273 top end, your 904 trans(rebuilt), your convertor(rebalanced) any rear gears with a limited slip, and 318/273 cam
With the closed chamber heads, you compression ratio will skim 9/1.
The extra cubes will pump up the bottom-end to ludicrous.
The small heads will run out at say 4500, but, put some valve springs on her to rev to 5000 which with 2.76 gears, and 25.5 tall tires, would get you 50 mph@10% slip.
AFTER you get that tuned, put a few hundred miles on her. Then if you still want a lumpy cam, well then get one of those poser cams, with all that .008 duration, but modest 050, and a convertor in the 2400 to 2800 range. Just be advised that the smallest one will be bigger than you need.
But they idle nice.
Fyi.
I'm about 35 miles North of Valhalla