Headers/Exhaust Manifolds

Unfortunately, "W-2" and "inexpensive" don't go hand-in-hand. There are no OEM style exhaust manifolds for W-2 heads and, like most inexpensive headers, won't match the exhaust ports. I guess you have only the "race" exhaust port bolt pattern? Some had both.

Many W-2 headers use exhaust adapter plates. They can be a pain. TTI has a choice of 1 5/8"-1 3/4" step headers or 1 7/8" straight pipe. The step headers, despite the smaller size, are a good, versatile option. The regular port versions work great on my combo, running 11.20's and weighing 3,540+ lbs. The more HP, converter, gear, etc. you have, the better the 1 7/8" version may be. But I like to lean on the conservative side. The smaller headers can also provide just a little bit more clearance.

Step: http://www.ttiexhaust.com/Category-ClassicHeaders/340W2/TTi340W2.htm

Straight: http://www.ttiexhaust.com/Category-ClassicHeaders/340W2178/TTi340W2-178.htm

TTI's also clear all regular oil pans, including the Milodon 8 qt., and don't need an oil filter adapter. Just use the plate screwed directly into the block. Their interior and exterior coating options will help them last and probably make more HP as well by keeping more heat within the pipes. Best fitting headers available. If they touch anything, it's probably something with the chassis, frame or mounts.