You considered going with some RA manifolds instead of headers, Dave? I actually once ponied up over $100 for some used headers for my car, then threw them out. Headers tend to rust, dent easily, are a bit*h to fit, and leak. I have heard that for a street car, a RA manifold will do just as well to free up the flow.
I'd also consider upgrading to a set of taller gears for my car, but I always found that with the torque of the 455, even my highway gears got the car going, and it actually cruises pretty well on the highway. Heck, I spent a year commuting back and forth with this car from western Mass. to Providence for grad school and it was a comfy ride. Was funny to park it next to all the richy-rich kids' Benzes and Bimmers in the Brown student parking lot lol.
You have AC in yours, I assume? I pulled out the entire ventilation system for space savings and because I'll never drive the car year round again. Makes working on the passenger side much easier! lol. Just have to fab up some kind of a cover plate for the hole in the firewall.
How's that for babbling? Maybe others will join in!
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