As long as you overflow is rated for what the pump will be supplying at the head height, you will be fine.
On my frag system, I have a 1" bulkhead. It will max out with a Mag7 at about 3 ft of head.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,