We've been building 610/630 Mopar big blocks using TF 240 heads, Trick Flow intake, 10:1 compression and a modest hyd roller cam so that is what I'd build for a boat. The "pro street" type cars get the TF 270 heads with the Indy intake and a solid roller cam and they make around 700 hp and 650 torque. Your engine is a mixture of those parts. Are you using a Dual Sync distributor with the Holley EFI system? Where do you put the O2 sensor when you have a water jacket exhaust? Did you build the EFI system yourself? I see the port injection on the intake but can't tell which ECU you're using.