The first 95 diesels used the 248 engine, and they were OK but difficult to start. The 1967-1969 model 95's used the 303 diesel, and they were great engines, would start in sub-zero temperatures and were very fuel efficient. I could cut 80 acres of beans in a day and usually only burn about 35 gallons of fuel.
I find it ludicrous that people would be stupid enough to cobble GM V-8's on a late 95, or for that matter a 354 Perkins. The Perkins engines were sick sisters in 750 Massey combines. I just don't like to see such abortions, when a 329, 359, or 414 Deere engine is a virtual bolt-in. All of them better engines than a Pukins (misspelling intentional).
Our 95 with a 303 would handle a 20-foot platform, we put a 653A Row-Crop head on it, and a 643 corn head when shelling corn under 100 bpa. Worked fine, and never ran out of power.