Yes the injectors are loud and that is a great idea to have an insulated cover to help with the noise. I was thiking of insulating a cover and put it on the the top of the intake to see if that would help.
As mentioned I'm using 7.425 push rods is what is called for by the base circle measurment and 1.7 Harland Sharp roller rockers.
Long tube headers carries the noise also..
I'll get use to it eventually.

Thanks JR...
Sleeper