For the BEST intake option, here's a quote from Dennis @ Airflow Development:
For the money I have not found anything that will touch the Motown or GM Bowtie intake. On a 358 sportsman motor, the Super Vic takes about 6 hours more to almost make the power of a properly setup Motown.
When asked "What's involved in properly setting up the Motown"?
I adjust the elephant ears for runner length, get the radius right on the carb flange to bottom of plenum, adjust CSA and taper, port match to cylinder head and bolt it on.
No welding, No wild spacers...very easy to work on. Total Job cost $375.00. I have had well over a grand in Super-Vics pre-bowtie/motown and they don't touch the new stuff.
american stuff , but sometimes i think we get gouged for it ,, maybe maybe not ,, who knows ,,
i read an intake test on a 355 ,, didn't say what was in the motor , bowtie , super vic, strip dominator , hurricanne intakes ,,,,
the strip dom won the HP war but the hurricanne was next and the peak torque was greater with the hurricane ,,, and at a lower rpm , the super vic and bowtie had very similar results , very close ,,,, the strip dom got creamed by all of them until below 5000 but came to the front above 5000