I'm a little late getting into this thread, but I figured to add another post, especially since I saw Critter's post (it's dave u. from poncho).
I've got a 76 455 T/A that I've owned since 94. It's seen some changes over the years, but it's still in primer. The 455 had 5K on a rebuild when I bought it so only the top end has seen any work. Currently the engine has ported 96 heads, an Ultradyne cam, Performer RPM intake, a home built 73 Buick 800 cfm quadrajet, headers and a Flowmaster exhaust. I've had custom springs made front and rear and the car is approximately 3 inches lower than factory specs for the 76s. This may sound sorta rice, but it sits pretty close to a 70 'bird stance, which is what I wanted. I also added subframe connectors, poly bushings and I forget the rest. Best time at the track is 13.965 (IIRC)@ 100 mph on the stock heads before they were ported. Since then I'm up to 102 mph but can't break into the 13s. A trip to the dyno showed I was putting down 350 ft-lbs at 1500 rpm so the cam centerline had to change. I moved the cam a bit and replaced the Holley with the current quadrajet and last run on the dyno was 320 hp and 400 ft-lbs at the rear wheels, with a big vacuum leak. I refuse to go back to the track till the 3.08s are replaced with 3.42s since the ST-10 is my current weak link. Hope to get some better numbers soon.
Dave
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