Cam recommendation needed

If you had to absolutely have a hydraulic flat tappet, this is in stock and would be the upper end of what you could get by with running in that kind of grind. And it would definitely need a GOOD converter to get the best out of it. I almost put it up in the first post. I don't know how big of a hurry you're in, but everything I post is in stock. There's a five month wait time with Howards right now.
Howards Cams, Hydraulic Flat Tappet Camshaft, Chrysler B/BR, 243/251 @ .050, .519/.540, 109 LS - Competition Products
But honestly, you've spent the $$$, it deserves better... you could try a hydraulic roller, but I'm not a fan of hydraulic anything right now, internal lifter quality is hit or miss at best anymore. Here is a super street friendly (in a 10.8:1 470, anyway) in stock Howards grind.
Howards Cams, Rattler Hydraulic Roller Camshaft & Lifter Kit, Chrysler BB B/RB, 235/243 @ .050, .530/.530, 109 LS - Competition Products
But if I went the hydraulic roller route, I would talk to Oregon cams about grind number 1529.
236/[email protected], 288/292 advertised, .561 lift @ 1.5 intake and exhaust, on 110 intake and exhaust lobe centers. It comes in a 110 LSA but I would get it on a 108.