There are no kits that I know of for what you want. But all of the electrical connections are available you just need to know what your looking for or have a smart parts guy. For the vacuum hoses. Parts store and get a couple different sizes and plenty of it. Change one hose at a time. Stock motor mounts will work. 305/350 are the same size on the outside and the way they they bolt up.
1984 SS, w/87 Grand National 2004R, 355 vortec, CCC, Crane XE262.
1969 Road Runner
2003 GMC Serria