Regarding heavier FE blocks; when I first came on this forum, in Sept of '19, one of my very first questions was "When did the FE change to a thin wall casting", apparently, like others, in the past, I was told that it had ALWAYS been a thin wall casting!!!
At 77, I lived threw the original FE period and I knew that was BS but, how do you tell the modern FE guys, they are wrong? It's hard but, as time goes on, the truth comes out. One thing I know, for a fact, is that there were NO thin wall, Ford castings, of any sort, until the 1960 Falcon six. FE's before that had a Ford spec, of .170 min cyl wall thickness and recommend max a over bore of .060. The 292 had that same spec. My 4.050 bore 361 Edsel engine must have the same .170 cyl wall thickness spec (.140 @ .060), even with the larger bore. My Edsel, after boring .060, the thinnest major thrust side is .188 and minor is .153. Remember that .170, is min wall.
I can't say what the spec is for the '61 - '62, 352, 390 & 406. I haven't found that yet but, it would make since that it may have changed with the modernization in '63 but, Ford never made a public announcement, to that effect.
Several, older guys on this forum (including me), have posted that they had or new of 1/8" over bore 352's and Ted Wells, a high end FE guy, of the 60/70's, that was foreman at Valley Head Service, has said the earlier FE casting are thicker.
I'm always on the look out for Ford factory drawings and maybe I'll find one with that revision, someday. Until then, I will keep using my sonic test gauge, I would never discourage that, even on a early block.