V8 swap info

If this belongs in the mangum swap thread, I apologize. I thought since it's specific to early A bodies, I'd put it here.

After going several rounds with the 170 /6 in my sons 65 Valiant, we might just pull the band-aid off and drop a V8 in. With all of the transmission options, I'm trying to decide on the easiest short term solution to get it going and maybe change it for something better later on.

Engine will be a 5.2 or 5.9 Magnum, most likely from a 2000ish truck

I have on hand ...

The 3 speed out of this valiant
An A-body A833 that needs a rebuild
A 3 speed to small block bell housing from an e-body
A 3 speed from the same e-body

Reading up on this it looks like the path of least resistance is to change from manual to automatic and most likely a 904. I've read if we put a 904 behind a magnum, we can keep the same drive shaft that's behind the /6+3spd that's in the car now.

I believe the a manual will require the drilled crank, however if I get one with a drilled crank, I can use it with manual or auto. os thats what I'll try to find.

My biggest question is about fitment. i don't have my shop up yet so i don't have my compressor, welder etc operational so I need to know what i can get away with that requires the least amount of fabrication.

Obviously long term plans would then include various upgrades to suspension, brakes etc.

At this point everything points to the 904 but if there are other options, I'm all ears.

Any input is appreciated