what about a 151 cube Nova 4cyl? easilly workable in a T. 2.3 Pinto motors are also a good option. Even if you wanted an I6, Ford 170-250's would make a great motor for that, 200-250's can be found in 1970-1981 Ford Mavericks, Mercury Monarchs and Ford Granada's, and the granada/ monarchs had an option of a 4spd which is very simmilar to the Toploader, For auto's, they all had C4's, and the 250's have the SBF bolt pattern so any SBF trans would bolt up.