Why not fit a 300 cube six from the same famly of engines... THey produce MORE LOW down Torque than a V8 due to the Crazy stroke.. , and respond well to mods.. People have even Cast up alloy Heads for these motors. In a 66 mustang there was a 300 cube that ran a low 12.. So the power is there...
Cams, extractors roller rockers are all avalible... You can have 60 cubes for free.... why not take em
98 T5 gear box (was auto)
Wade 977b cam
AU bottem end
ELXR6 ported Head