If you're going to lie that big, may as well badge it as a 198 /6 and just don't pop the hood!
I'd drop in a B block, get the 440 Source 383 stroker kit with the 3.750 stroke crank with a +0.060" bore, a B block six pack manifold and slap on some 440-6 badges. Or if you go with the stock bore, say it's an ultra rare 426 wedge low deck. Since you're in need of an intake, you can find a cross ram intake! The bowtie drivers won't know the difference. You will have just a bit more room than with the RB, and definitely better coolness factor.
You're going to be in the same price ballpark no matter which heads you get if you go big or small...
That leaves you with deciding on the hemi orange or turquoise blue for the block. If you go with orange, get black plug wires and aircleaner and paint a jack-o-lantern on it so you have a Halloween color scheme in your engine compartment.
