Care to speculate my 340?

I have a 340 with the same comp cam indy rhsx2.02 heads 10-1 cr air gap intake 770 cfm holly and dougs headers.car is 69 barracuda 391 4spd hasn't hit the road yet. i am hopeing 400 hp. I know its going to be fun to drive
You should be close , I hit 398 hp 413 tq with light porting on x heads 10.5 Mahle pistons and Air gap intake .