hood clearence should not be a problem unless you get carried away mounting it way to high onto your frame
is yours the one with the steering box in front or behind the A arms????
I would use the one with the box mounted out front to give yourself more engine room.
I don't know how good a BB will fit in the subframe as the one I did in the 36 dodge went with a 360, that fit perfect
now a mustang style frontend will give you more engine room because of the front mounted rack and placement of the crossmember.
like I said in the other frontend thread not all frontends work with all cars, some work better in different application. I still think that the nova frontend (if the box is up front)will work great in your car, you will just have to work motor mounts and exaust