Question on a 390 in a 57

[sprink88]

I have a 390 I just got all my parts for, so I will be getting ready for the swap soon...

I have a 57 Fairlane with the y block 292. I went ahead and purchased a 68 Galaxie 500 pulled the engine and trans and sold the car.

I plan on using my original Y block motor mounts (heard they will work just flip them around). A lot of people say the FE is a bolt in. Does that include the transmission? I believe the trans is an MX by looking at the pan. Do I need to modify my crossmember for is that part of the bolt in?

Also the Galaxie driveshaft yoke has an external weight on it? Do I need that or what should I use?

Thanks in advance,
~Chris