I was thinking about getting an FD upper and lower intake manifold for my T2. does anyone know exactly what i would need to convert?

 

They only fit on S5 T2's I think. I'm not sure if you only put on the upper intake manifold or both the upper and lower.

 

Upper and lower plus an adapter plate that has to be fabricated some how

 

Hmm, I hadn't thought of 3rd gen upper and lower and a plate to adapt and finish the ports curve (3rd gen has curve in engine "block" as opposed to lower manifold to keep the manifold closer to the engine.)

On my 87 TII I used a 89+ TII lower manifold as the stud pattern is close enough to mill the 3rd gen UIM holes to fit.

The minimum things I did to get it to work that I recall were
1. port match 3rd gen UIM to 89+ TII LIM primary runners
2. mill 3rd gen UIM to 89+ TII bolt pattern
3. cut down TII oil fill to block tube so it can go under TB elbow
4. make OMP (I have mechanical OMP) actuator lever and cable off of 3rd gen 2ndary throttle shaft
5. drill and tap, weld in or block off unused solenoid/vacuum holes
6. custom throttle cable and mounts
7. adapt whatever TPS you will use
8. modify 3rd gen TB elbow to point in a reasonable direction- I cut and welded a Greddy aluminum one
9. make UIM to engine support bracket
10. take the time to think it through and plan out many other operations besides these basics to make it "right" instead of hack.

For example-
1. weld material between primay ports on UIM to reinforce the flange area ported thin to match 89+ primary runners
2. enlarge smaller 3rd gen UIM primary ports and reshape their curve
etc.

then plan out optional mods you may want like
1. remove double throttle system and cut out its support in UIM
2. cut UIM bracket to accept aftermarket 2nd gen fuel rail
3. port and polish manifold runners/TB
4. machine off all emmsions bosses on the castings for a clean look