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I would leave the fender 383 badges alone. I can attest to the fact that back in the day of these vintage muscle cars, whether it be a Mopar or GM, engine swaps were very common. One example is a chevy SS with 396 badges that really has a beefed up 427.
I agree with those who say to leave it...
My first car was a Chrysler 300, 440 TNT. Unsure regarding the stamping on the block machine pad, but it did have the smaller valves and dual exhaust. My car from college, a 67 GTX, 440 Super Command does have the C 440 HP stamping with 915 heads (I still have it). Our family also had a 65...
I ran the 509 cam in my 67 440 using a TM7 manifold and the factory 4327S AFB carb. I didn’t have to go too far away from stock metering rods and/or adjustments.
I would think as long as it’s the correct date letter for that year. Consider a vehicle with a factory replacement engine under warranty.
I was lucky to find a replacement engine out a salvage car of the same year and model as my 67 GTX,(C 440 HP w/915 heads and 4327S AFB $200.00
If any part of your exhaust system (ie...a hanger/strap, anything metal) is actually touching somewhere around the floorboard area, you've created a complete sound system for the inside of the cabin area. It's the same as taking a simple tuning fork and placing it on top of an upright piano...
I’ve had a torque converter go south on me. It made for very little throttle response at lower rpms regardless of speed. The other comments regarding linkage adjustments and/or overlap sound to be most likely.
Not only is a necessity but make sure you install the correct temp. thermostat for your geographical region. I believe the temp.# is stamped in the center.