Lift doesn't always make the durations shorter as most mfg's make different grinds.
Here are the rest of the specs on mine. I realize yours is a 327, and although Jerry has a ton more experience than I and may differ, I think they're similar.
350 bored .030 over, flat top pistons, 64 cc double hump heads (194 intake, 160 ex), full roller rockers, comp 286 magnum cam, holley 650, Edlebrock RPM Air Gap intake, stock ram horns (probably my biggest restriction), 2.5" exhaust (had to flare it a bit after the ram horns), flowmasters dumped just ahead of the rear axle. I'm running a saginaw 4 speed and 3:35 rear gears.
I've pulled trailers loaded with stuff from a 1/2 ton pickup to fencing materials including cement, as well as a boat. The truck performs very well and I can run 70 on the highway at 2700 RPM when I'm not pulling - when pulling, I usually max about 60 by choice and can hold it well.
For my taste, it's really not that loud. Here are a couple of clips made about 3 months ago..
http://smg.photobucket.com/albums/v228/Avette4me/video/?action=view¤t=20091127173140.flvhttp://smg.photobucket.com/albums/v228/Avette4me/video/?action=view¤t=20091127173255.flvAnyway, that's my .02.
Have fun with your build...
