Okay, here goes.
I have all new parts in this rebuild of my Hot Boat motor. Except for the heads that have about 50 hours on them. They are AFR 335 rec ports with 112 chambers. 2.25" intakes and Inconel exhaust. I have Edelbrock dual 4 intake with two Edelbrock 1405 600 cfm's that are jetted very rich.
When I first installed my cam I lined up the dots for straight up. I did a short cut check on the cam timing. (my bad). Now I have degreed the cam properly with the intake set 22* BTDC @ .050", exactly what the cam card says and closing at 58* ABDC. I have a multi key timing set so that is easy but it says I am 4 degrees retarded. There is no indication that my Comp Cam has 4* built in to it. The solid roller Cam specs are 296/304 @ .020" lift. It has .714" gross lift both sides with 108 lobe separation. Maybe a little big for a 10.5:1 comp ratio. We only have 91 octane in Cal.
The boat had a 3* retarded hyd. roller cam. Ran great on 91 octane. I have built 5 BBC in the last 15 years with no problems, all boat motors. This 565 is in my Pro Street Vega with a built Powerglide, trans brake and a 4.88 Ford 9" spooled Diff. I run a 33" Hoosier slick. The car has run in the 9's with a small block.