308 or RHS on a 408

Seems I read somewhere that the RHS/Indy intake port opening is somewhere between an LA and OEM Magnum size. But the not-so-obvious volume is more.

408 c.i. is plenty big, but I tend to lean on the conservative side because of the street application and gear. Same with the carb/intake combo. If multiple carbs are used, hopefully they will be properly tuned.