Broad question from a rookie

Call Brian at IMM and ask about a 408 for freeway cruising, like your original post stated. You can do this with EQ iron heads(low price,great power) and stock rockers, a performer airgap intake, and a torque cam that will get along well with a tight converter and 3.23 gears. You should end up with a very fun cruiser motor with tons of torque from about 1800 rpm up.