My HC was took far down and i didn't have a way of clamping the HC -> WP. So i riveted metal to the bottom and cut the same up top, while re-inforcing the top(floppy hole). I also busted my composite shroud while trying to drill mounting holes, it's still going though, with aluminum:
I too off the inlet barb on the pump and dremeled out what was there for 3/4" ID tubing. Then i replaced the outlet with a 5/8" OD barb. Leak testing now.