Realistic difference 340HP vs TTI early body headers 273

There is a set of manifolds on CL for 100, are these worth picking up? I know theres a bunch of them at the junkyard and i plan on swinging by tomorrow to have a look. Any particular casting numbers i should be looking for?

Here's the CL ad. http://phoenix.craigslist.org/nph/pts/5124030402.html


Jake

Those are not the right ones, Passenger side is good. The 64 to 66 Drivers side only is different. The rest are a pain, shifting motor and or steering column. If they even fit or have any clearance.