340 HP's vs headers

This is an interesting option which I'd like to know more about. Does anyone else have any insight on the tight tube headers? My setup is currently a stock 318 with a Holley 600 vac on and Performer intake & 2 1/4" dual pipes. Cam is going in this summer & looks like it will be 224/230 @ .050 w/ .477/.480 or 218/224 @ .050 w/ .462/.470. looking to reach somewhere around 280-300hp range nothing radical. I do have power power steering will that make a difference in what will fit? Will I still need to change to the mini starter for clearance?

I am running these headers on my '70 Duster with power steering and mini starter; the factory one fits but only with some grinding of the collector flanges. They fit fine although the head pipes were tough to make and I have scraped them pretty badly; find the best exhaust shop in your area to do it and make them like jerry6's car. Also make sure you buy 2 1/4" collectors to bolt on instead of the puny <2" ones that come with the headers.