One suggestion----the engine really needs a methanol injector---manually actuated---it helps to keep the engine "happy" in traffic and also produces a little more HP.

The engine specs is very close to my son's GMC truck engine---a few more inches and a little less boost. His blown 355" produced 720HP on the Superflow, his 5000 lb. truck ran 7.0/101MPH with mufflers and street slicks at the local track---and then he drove it home!