273 318 interchangeable parts

Can someone verify that engine accessories and parts from a 1967 273 are interchangeable with a 1967 318.

I have a 273 (in a 67 Valiant Signet 4 dr) and plan to buy a 318 long block and want to use most of the parts from the 273. The final 318 will go in a 67 Barracuda fastback. Also, will my slant 6 3 spd manual work with the 318 with a new bell housing?

Thanks for any suggestions