Whats the biggest street cam I can use?

I would just try the cam you have, see if it likes it......but I must say, I really don't understand you reasoning for the build. Having heads that flow 380, the race block, Jessel valve train ($$$$$) with a small cam that doesn't leverage the head flow is a crime. It's like building a drag car with the best parts to run in the 9's and INSISTING on using an open differential rear end with 2.76 gears....it just doesn't make sense to me.

Not trying to step on your toes, its just if it were me, and I spent that much on a motor, I would expect nothing less than single digit 1/4 mile times.

I would talk to Bullet cams for a custom grind.