I still like the Crower 271HDP the best or Fast's pick (which is pretty dead-nuts similar)

Another great hot 340 or 383 Hydraulic cam with at least 10:1 is the old Ultradyne 231/239 on a 108 spread, bullet can still grind it.

I had the "Old" .471/.474 Street Hemi grind Purple shaft in a 383 4 speed way back 35 yrs ago and it ran surprisingly well in a Big B body with 3.55 gears.

I would imagine the .484 would be ok with a decent 3000 stall and 3.91's, it ran good enough for high 11's (7.50's in the 1/8th) in a well built 440 in my buddy's E body cuda in late 80's and low 7s (mid 11's) in my 73 duster on a stock 69 short block with ported 906's.

383's are just kinda soft out of the hole (below about 2800-3000) but that actually used to be an advantage on street tires back in the day.

If I HAD to build a B motor with stock bore and stroke I know today I would build a 4.375" bore 400 but with the longer 6.76" 440 rods which would allow you to run a ~1.53" CH piston which is the same slug you would use for a 4.15" stroke RB using 7.100 rods. you would need to bush the little end "old school" style to .990 BBC pin to do that so it might be easier to just go aftermarket rods anyway. That would be nice revving 406" motor with a much lighter bob weight.