All in tank nova pumps bolt in so no problems there
Yes the pump inside there fitted to you nova caseing will work fine
strip the Cav pump out and measure the height of the nova pump from the bottom of the filter to a fixed point on the top part then when you swop the pumps out you need to make sure the overall height of the pump is the same as the Cav pump is 25 mm longer
if you do not do this ^ the pump will be to long and when you bolt it up you will just close the hole at the bottom of the pump and no fuel will be pumped out this is not good
so take your time it's possable to do but a little fiddly