340 Max Bore

I'm kind of leery of a .060 overbore on a LA block, too. I think it depends more on the intended use of the car. I'm more inclined to say OK to which ever engine you prefer since you state the Demon is to be a daily driver. Unless you're racking up mileage a ¼ mile at a time.

My preference would be for the second engine. Either way you'll need an intake and a carb, possibly a cam, too. The second engine will give you the intake system as you pointed out to offset the cost. The first engine will need less cam to be suitable for a daily driver.

CCA-20-741-9 listing from Summit: Camshaft, Mechanical Roller Tappet, Advertised Duration 280/286, Lift .570/.576, Mopar, Small Block LA.

The stock 340 cam had these specs '68-'73 340 .430/.444 lift 268/276 duration; the '68 340 with manual trans. was .444/.453 lift .276/.284 duration if this helps you make comparisons with the cams available to you.