Limits of an Edelbrock performer and 1405 600cfm carb

You really can't drill the intake for the Magnum heads, you have to drill and tap the heads for the LA intake.
I think your over estimating the power output. I would think 280 to 290 would be closer.
It would be hard to get a pickup truck to run 13's with a 318.

Well I'm not gonna a try to make the pickup run 13s lol. Maybe the valiant. So with a tab bit bigger cam with some more duration will that goal be more reasonable?