Build what you have and budget allows is what I believe.
If I'm to question the reason for a 318 or 383 build then I would say, why waste your money on a 408 when for the same amount of money you can build a 512. lol
Plus people like to do things against the grain, I agree most would be happier with a 360 or 408 but really since 440 is still readily available and from performance to dollar driveability stand point no one should build less especially when you factor gear and stall. No replacement for displacement unless it's big block seems to be the A bodies motto.