I believe the D3VE-A2A is actually the number off the cylinder head and would be valid for a 72-74 429/460. Based on the information you provided, I believe the block number is probably D1VE-A2B.
This particular block is referred to by some as being in the "early" family of the 429/460 motors. Like the C8VE and C9VE blocks, it has thin rails and is internally balanced. Some D0VE blocks have the thicker rails. C8 and C9 blocks started life in 1968 and 1969, respectively. D0 block started in 1970. The suffix numbers/characters are simply modified versions of the original casting and should not be of any real concern for performance expectations.
Like all the 429/460 blocks, the D1VE is a a good start for a performance build. As the second character (digit) indicates, it started life in 1971. The suffix again is usually only related to certain engineering modifications.
Do the right thing!