slant six to a 360

Just pulled the slant 6 from my 69 dart and i plan on putting a 360 in.
will i need to replace the crossmember ? will the motor mounts fit a 360 or do those need to be replaced as well. Any major problems im going to encounter ?

any info on swaping a 360 from slant 6 would be greatly appreciated.

Thanks,
Phil.