If you're trying to do it on the cheap, put it together and let it rip. 9.5:1 is a little high for pump gas, you'll just have to knock some timing out of it to keep it happy.
Is it all perfect... nope. Will it sill make a bunch of power... yup.
The only thing is the cam a
285@.050" lift? If so that is huge. If the blower is really small, you're going to have to keep the RPM of the engine down. A 1050cfm blower won't keep up with a 451" motor to high RPM.
Call vortech and ask them what kind of RPM this blower will support on a 451" engine. Buy a cam to match, and let it rip.