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Usually a backfire is from going lean, ether the float level is low, or the accelerator pump isn't working properly or mis-adjuisted, if it happens when the throttle is opened quickly. Since it is idling smooth, I would guess it doesn't have a vacuum leak My $.02

I'd guess the engine dieseled and turned backward when it turned off and puffed smoke back out of the intake. Probably got some old/low octane gas.

Is it possible the ignition wires were installed in the wrong place on the distributor? Did you do the wires one at a time or all at once?

I knew 70 and 71 6bbl engines came with big rods. I had a 72 440 4bbl CHP motor that had big rods. My question was did 440 4bbls in 70 and 71 have big rods. and the answer is yes.

Now that I think about it, the only 70 up 440s I've been into is a 70 Superbird 6bbl and the 72 CHP car, both with the 6pack rods and damper, all the other 440s I've messed with are older. Saforwardlook, that is a beautiful E! Thanks for the clarification.

I've rebuilt a few HP 440s in my time, and only one, a 1972 Polara CHP 440 4 bbl had 6bbl rods. I watched an old YouTube vid today from Nick's garage and he said that "most" '70 375 horsepower E body 4bbl 440s get 6bbl rods. What is your experience with B or E body factory 440's? Did 70 or 71...

It wouldn't hurt to drain the converter and put in as much new ATF as possible (if the converter has a drain plug) My $0.02

Is there slack in the throttle cable? Just "thinking out loud" (on the keyboard)

Rotted vacuum plug? My $.02

Is your vacuum advance connected and is it working correctly?

I know from personal experience, you won't have any problem finding the drive shaft (if it is different from the 3 speed) the A833 and the A727 uses the same driveshaft. Any A727 automatic driveshaft will work. My $.02

Another thought, is it possible that the exhaust valve spring was broken while it was compressed to change the valve seal?

I had to put 2 bottles of friction modifier in my 742 power lock dif to stop it from clunking around turns. my $.02

I ran a 440 with the stock Holley 6bbl setup in my original 383 Roadrunner, using the stock 5/16 fuel line and stock fuel pump with no regulator, the car ran to 5500 and ran 13.08 at 103.8 in my opinion you don't need any special regulator. There are high pressure mechanical pumps that would...

I've heard 1 quart of ATF in the oil, run it easily for a short time then change the oil. The huge amount of detergent in ARF can free up lifters.

Question: did you confirm the timing mark on the damper? Maybe advance it 5° more to see if it runs cooler or starts pinging, needless to say, if it is pinging, put it back ASAP. make sure you are setting the initial timing with the motor at idle < 800 RPM. My $.02

Many decades ago I bought a 440 from a storage auction, got it for $40 I pulled it apart and found the rod bolts were stretched more than 0.015" they must have been torqued to more than 75 foot pounds. If I ran the motor without replacing the rod bolts and torquing them correctly, I'm sure the...

I'll put my $.02 in, I think the plug wires are off by one terminal on the cap.

I wanted to add a thought, 5W30 is the same viscosity (the 30 part) when the motor is up to temp, it is a good substitute for 10W30 My $.02

I've never had any issues dropping the X member on ether a C or a B body, but I've never worked on a non California car, no underside rust. pop the 10 bolts (yes there are 10) and replace the mount.