suggestions for my 340?

Your brand spankin new at this huh?!
OK. Here we go.......

Your question of will they clear power steering is answered at the web site. Diddle your fingers over to Summitracing.com and use there super friendly search engine to look up a part and click on it to read up on it just incase there not for your car/engine combo.

The summit headers are a typical 1 size fits all header that are just like everybody else's 1 size fits all header. Clearances vary just like any other header as well as the quality for the fit.
Of all the headers I have used, the Summit and Headman's were equal in the excellence in fit a d clearances. But this statement does not vouge for them. I'm just saying MY Experiance with them was good.

While nearly identical looking headers from Hooker, Black Jack, cyclone and a few others I had but can no longer remember, have fit poorly.

As far as installing headers on your car, it is a near 100% "For sure" you will be super pissed off, run through the gambit of curse words and maybe in several different languages and, ill give it a 85% chance you'll make up new curse words along the way.

It is nearly impossible to raise the engine and car up high enough to instant hem and you'll scrape the nice finish off. During installation you'll scrape, scratch and cut your hands and knuckles open and
More likely discover a mystery cut via a mystery blood stain somewhere. You'll remove tons of parts without any real clearance for the part. I'll give it an 80% chance you'll need to modify the header via a hack saw and/or hammer to bent the tube in order to clear something.

After you have this installed, you'll have further fits of rage and dis-spare with modifying the OE linkage from the column with flipping the linkage and a cut and weld in some cases. or yet more fit running a some aftermarket Lokar cable system.

You may run into trouble on the otherwise AKA "The easy side/passenger side" with a possible lack of the OE angle oil adapter for the filter.

Once the headers are in and your sessions with the 2 doctors or finished, (1 physical, 1 mental) I ga e you the easy exhaust to install, which I have used myself. You'll need ethier a metal bladed circular saw or good aim with a sawzall. Super talent is required with a hack saw along with those muscles that you almost never use. Advil is your friend.

The exhaust system from Summit racing was easy to install and fit pretty darn good. It slips into easy other (the pipes) a d requires little trimming at the bumper.