cam selection for my 360 in my dart!

Hey everyone I'm new here wanted to get some advise on the almighty best cam for your setup opinions. What's the best ideal brand and if I should stick with hydraulic flat tappet or solid flat tappet. I've been researching for awhile now. And I'm just not sure what to go with? I'm looking to pull 400bhp out of my engine. So here's my setup! 67 dart gt 360 with March pulleys 600 cfm carb which I plan on upgrading to a holly and a torquer 2 340 intake 360 j heads stock ports and rockers cam current is comp xe 256 hydraulic flat tappet with comp spring and lifters stock pushrods bored 0.30 over Keith black hyperpuetectic pistons comp is around 9:5:1 to 9:8:1 eagle rods stock cast crank high volume water pump and a holly electric fuel pump. Built 727 with full manual valve body and a 2500 stall. Rearend is a amc 20 with limited si and unknown gears. Would like to change. The car will weigh around 3000 lbs or so. Let me know what you guys suggest thanks!