225 slant 6 Port fuel injection

I am new to the slant 6 but have been a gearhead my whole life. I am rebuilding a 225 slant six with my son for his 68 Duster. I am looking into installing port fuel injection instead of a carburetor. Iv'e been told that the throttle body style isn't that good due to the long intake runners used on this engine so port injection sounds better. That being said I found a manifold but I have no idea what I can get as far as a kit or individual components to get it done. I do have experience in tuning this type of system on Motorcycles so I'm not a newbie just a newbie in this engine any help would be great.