I have finally found a great '52 5 window 3100 to restore. I am being advised locally to get rid of the 216 and swap it for a larger, more reliable 235. I have also been told to get rid of the enclosed drive shaft - and to get a new rear diff with gears that are higher than the stock 4.11. My questions are: 1) will these changes devalue my truck?, 2) If I swap out to a 235 - what years will match up to the old 52, and 3) can I keep my enclosed drive shaft - and rear-end - and put in a different rear-end ratio such as 3.55s? Thanks for any advice that you can give! :confused: