Will a ford 352fe flax plate fit on a 390fe?

I'm doing a motor swap soon. Pulling out the old 352 and puting in the 390. The 390 was in a 70's truck with a 4spd. My truck has a c4 auto. Will the flex plate from my 352 fit on the 390 since they're both FE's?

My car doesn't start or has a hard time starting?

I have a 2005 Ford Explorer XLT V6 4.0 Flex Fuel with 126000 miles in it. When staring the engine it turns over fine, then sometimes sputters and stalls. I have to push the gas peddle to keep it alive.
I just changed the fuel filer and put new spark plugs and wires in. I think it might be the gas pump.

Will a 4.6L V8 torque converter fit on a 5.4L V8?

This guy sold me a different engine they are so identical! The only difference is the exhaust and torque converter. Would you happen to know if the 4.6L V8 torque converter will fit on a 5.4L V8 flex plate?

the 4.6 is a 2005 ford e250 and the 5.4 is from a 2006 ford e250

also what will happen if i use the converter? I have heard some people have done it

2000 Ford Taurus Flex Fuel. No Start, No Fuel Pump priming?

I have a 2001 Ford Taurus Flex Fuel, that was running perfect till a day I let the kids jump around in it and drain the battery with the doors open and radio on. And with the jumper cables in the trunk(trunk can only open with power button). We try to hook a extension cord to the battery cable leads…(please don't say how stupid it was, we all know. It was a drunken moment of stupidity)… Everything in the car flickered. But now i got a car that won't start. Replaced one fuse under driver side that was blown(now the dashlights work)… But when i turn the ignition forward i get no start. And i don't hear the fuel pump priming.

What would be my first step in repairing this disaster?