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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 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.
In the 80s' my 67 GTX (440) was my daily driver. I used the 3:23, 3:55, and 3:91 sure grips for highway, cruising and drag racing. For street and occasional highway trips the 3:55 is a good fit for all around performance with your tire size.
I drilled a hole through the top of the diver side frame rail and installed a sturdy size eye-bolt. Then attached to a front bolt of the block (440) with an matching size turn-buckle to the eye-bolt. This set up gave me the flexibility to adjust it slightly loose for daily driving, then less...
I ran my 67 440 (DC-292/509) set up with a 6-pack, then the 750afb (4327S) re-jetted and metered on a TM7 manifold. The 6-pack turned a lot of heads but the performance went to the single carb. I often thought about the possibility of running dual 4s (i.e.. 2x750afbs)???
Use a like product or if possible more of the same to losen up the surface material and only be as aggressive as needed. I might start off using a cotton rag for absorption, then finish with the microfiber towels.