I did it on my 73 454, it is in most of the performance build books and old shop guys all seem to do it. biggest thing to watch out for on these older engines is the oil you use. In the last 25 years, the government made them take much of the additives out that provide lubrication for flat tappet cams. You can get oils with the zinc/etc in them or you can use additives that have them. You see lots of advertisements now for them. I found out too late and had a cam go flat and had the engine rebuilt before I knew. If I had know sooner, I would have put a roller cam and lifters in. It cost more but reduces the friction/load on cam. You can also use more aggressive cam with roller lifters. Good thing it is a collector truck and not driven much.
