It is very possible to do.  Mine is a 4520. You will need to change the bolt pattern in the frame rails to the large pattern. You can just cut out the old pattern and weld in plate with new pattern. Use your manifolds from the old engine and all the holes in the hood will line up. Depending on your 466 is may not have a manual tach drive and you will have to use electric tach. My 466 came out of a 4850 and did not have tach drive. You can use old water pump and everything else. It has been about 5 years since mine was done and can't really remember any other major issues.

(45 Planter (Custom).jpg)

45 Planter (Custom).jpg (49KB - 888 downloads)

HP and torque differences are huge. My old 404 ran at 135 on the dyno. Pulling the planter in the hills I would have to downshift to 4th and open it up. Now I can leave it in 5th at about 1/2 throttle and it will pull right through. I have not put this on the dyno. It should be running at about 200 HP and I don't know if the 4520 PTO would handle it, besides it does what I want so I have all the power I need from it. A good clutch and updated rear end and you should be able to handle all the HP for pulling and working it hard.

I used a 4620 intercooler on mine so I would think it should work in that situation also.

I think the 4620 rear end was beefed up from the 4520 but if it does give problems you can go to a 4640 4 pinion which will be strong enough.

You should not have to modify the injection pump. With a combine engine the big thing is the oil pan and then the water pump.

7720 was not intercooled.  

We just made our own.  Took a steel plate and drilled the holes and then welded it in the frame rail.

650/65/38's on rear and 16.5x16.1 on the front. It is a nice light footprint for in front of the planter yet still pulls nice.