Which Stage V heads do you have? I went from a 318 to a 472 Hemi in a 70 Grand Coupe. I used the conversion mounts. The problem I had was my heads were early heads, 1978 castings. TTI had the only headers that fit those early heads with the conversion mounts. Yes and had to buy a Hemi brake booster as well. Also had to get a Hemi P/S mount to line up with the thick balancer. Also needed the small water pump pully. Used a Hemi dip stick. I added a shaker hood which you'll need to find small dia. carbs or find a base plate for the larger carbs.