Or at least i think it's the exhaust.

When i changed from the 396 to 350 i had to jerry rig my exhaust to fit. I haven't been able to get it on a lift and check it yet (Just moved, no garage available atm... Have to take it in to the local shop) But i decided to ask and see what you fellas might think it is.

It's a small ratling/knocking noise that only happens when it is in gear (Reverse or Drive) and the car is physically moving. It begins at about ~700 RPM (Like 10 MPH)and just gets louder as speed increases. If i really hammer it it lessens until i let off the gas and it gets loud again.

When i'm in reverse it almost sounds like the drive shaft is rubbing against something... IE regular intervals of a scraping sound.

I did a burnout up to 2000 RPM and barely heard anything until i started moving. In park/Neutral there is no noise up to 4 grand.

If anyone has any ideas i'd love to hear em, and will give an update after i get it on a lift.

Oh yeah, it basically started right after i changed the oil, which honestly doesn't make any sense to me, as the engine sounds beautiful when it's in park. I hope to god it's not the tranny, as i already replaced it once not too long ago, along with a flex plate.

Oh yeah, i found a 454 for a decent price as well. Might have to replace a few things, but it's a nice starting place.

http://seattle.craigslist.org/tac/pts/504338749.htmlMost likely this one. However a guy from work is also selling a 454 thats built to the teeth, and he wants to sell real bad.

I also found a 70 camaro, Rebuilt 350/tranny/suspension. All the misc window molding/kick panels. for 3500. I'm heavily tempted to purchase that car and just part it out for my car.

Hell the Rims/Rubber alone are worth 1000 Dollars. The chrome is another 500-600. Plus i'd have a car to tub and turn into a drag car.

 

Exhaust pipe rubbing on driveshaft? Broken trans mount?

 

Got it fixed, the exhaust had come loose and was rubbing on the axle.

Had to cut out about an inch to make it fit better.