360 head porting for big power (500HP ?)

Got a 248* @.050 106+3 .563 lift single pattern Hughes solid on the shelf. Thinking about going bigger though. Probably talk to the guys at Bullet.
I like the beehive springs. Much lighter retainer/upper coil mass than standard springs. Will run more RPM for a given amount of pressure. You can get them from Summit as Trick Flow 16918-16 $130 as opposed to Comp 26918 $180. They are all made by PAC anyway.