speed only comes from the tranny VIA RPM<<< of the engine if the engine has little horsepower it will not be able to spool the rpm needed to move the vehicle as well he wants a higher revving higher hp bigblock in his truck for more low end grunt and a greater top speed the .46 is a great engine no doubt BUT there are much more powerfull engines out there that will ram that truck through a brick wall if you so desire lol

thats the reason to answer your question