I put a Perkins 4-236 in my 39,000 lb 44' sailboat and loved it. I'd bought a pair that were taken out of a trawler after one threw a rod so had lots of spare parts, and new parts were easily available throught the local marine diesel shop. I didn't have a single problem with in in 2 years cruising from the PWN to New Zealand. It didn't leak or burn oil, which still looked like new at oil changes... as for power, if your not trying to exceed hull speed, 85hp seems fine to me to push around a 32. I could make headway into 50+kn wind no problem. One advantage of a 4 cyl is more space in the engine room.
That said, I also have a 4cyl 70hp JD tractor and twin Ammarine/JD 404's in my 36 classic and can't say anything bad about them either. Parts availability is fantastic at the local tractor shop or online. I'd even trade them for a pair of 85hp Perkins if someone made the offer, if only to gain more space in the engine room.
(I might be interested in the 4-236 for another sailboat I've got my eye on and if someone wants to take my GB36 off my hands soon. The sailboat currently has a Perkins 4-156 (62hp) which IS too small for a 52 footer.)
1974 GB 36 Classic #467 "Imagine That"