They will bolt straight on.
They have 2V ports.
The chamber is smaller than the 4V closed chamber. ( When fitted to a 351 they give roughly 1/2 a point more static comp than 4V closed chambers on the same engine.)
if you compare them to 351 2V openchamber heads they have the same port and valve sizes but a smaller combustion chamber.
They give a performance gain due to the higher compression they can give.
They have more valve shrouding than the open chamber heads but this can be overcome with some chamber work and a good cam.
By using the 351 73/ULP pistons that have the dish top with the 302 heads you get around 10.3:1 comp.
If you use 302 heads with 351 flat top pistons you get around 11:1 comp.
They work well with a bit of chamber relief around the intake and exhaust valve and a zero deck height with dish top pistons.