I did one for Stan Chapman in Augusta a few weeks ago.

He did have the butterflies in the manifold. I didn't have

much to work with so I just pulled the butterflies out of

the shafts and left the shafts in, retained in place.

(If you take them out you gotta plug the holes.)

HS6s may be more readily available than HIF6s. Either

one will work OK. Watch out for worn throttle shafts, especially

in the HS6s.

I can give you a list of numbers (on the small aluminum tag)

of models that were used on Volvos if you need it.

Some of them only had 2 bolts holding the aircleaner on;

most had 3. Your best clue will be the 4-bolt mounting

and the 30 degree inclination to the horizontal.