Andrew;
TRT code is for a truck application in `74 and `79 according to the
NastyZ28 database. Yours is obviously the `74 version as denoted by the cast date.
As far as being a tall deck, there were no tall deck 454's, only 366 and 427 cubic inch versions were built with tall deck blocks.
It should be a fantastic foundation for anything from a daily driver to a serious ground pounder. The 049 heads will easily support 600+ HP with minimal work as will a garden variety 2 bolt block.
Hope that helps.
Eric