Weiand #8007 intake on a 273 (Several questions)

He also said (tight budget) my converter was a custom built by precision torque converter. Hands down best 700 bucks I ever spent! Hed have tp have crazzy steep gear to avoid a converter with the 750 (like 4.56or even more ive had 4.56's & worked best with 4.10's! Good luck getting a corse spline 904 converter built at all! 1965 was small pilot corse spline inputshaft.