My understanding is the 201,218, 230 C.i. are all 23 1/4" long head. The 237, 251ci May have these ci off a little are the longer 25” heads
also the Chrysler and Desoto and possibly the larger dodge 1,2,5 ton trucks I believe had the longer head ( larger block) even in the 1930’s , but also the latter 1940’s chry and De So had the “ spitfire engine that is longer. My 38 plym tk can not fit the longer block
so I’m trying to identify this block to falicatate a possible trade for a 23 incher
casting number behind starter 666029
the sierial number isn’t trustworthy for proper identification as it looks modified
Bruce