Engine ID (year) help

T: engine built for a 1963-model car ("V" for 1964, "A" for '65, "B" for '66, etc).
22: 225 cubic inch displacement.
5: May (of 1963)
0: misstamp or partial stamp; there was usually no leading zero on single-digit dates (it would be "5 2" for May 2nd, not "5 02"). Misstamps are not uncommon.

2463430: 1963 to 1967 RG (225) block

-42: Casting line/tool number