Financing 570 HP from a 326 would probably not be the wisest choice for your budget. The same money invested in a 400 (or better yet, a 455) will give you far more driving pleasure. Horsepower doesn't move a car ... it's torque that does all the work.

You don't really need to find a spot for the engine. You need only store the long block - with the intake. Everything else on the motor will bolt up to the 400. (The intake will, too, but you probably would rather have a factory or aftermarket manifold that takes a Q-Jet.)

Motors can be stored with the flywheel side down by installing stem casters into the bell housing holes. I use coupling nuts over the stem to give the caster more rigidity. This keeps the long block mobile and takes less floor space than an engine stand or an engine on a furniture dolly.